NTSC Spectrum

50 messages · 2009-04-05 → 2009-06-10 · Yahoo Group era · View archive on archive.org

Participants: zxbruno, Oscar Arthur Koepke, Fred, cheveron, Don Dindang, Claudio Bernet, Hernán Pablo Alvarez, Al Hartman, Jack Boatwright, Timex, oscarkoepke, Paulo Leite, Bill Loguidice

Attachments in thread: 6 (see the archive.org item)

Preserved from the Timex/Sinclair 2068 Yahoo Group (2001–2019), which is no longer online. Text reproduced from the archive.org archive; email addresses masked.

Messages

1. re: NTSC Spectrum

zxbruno · Sun, 05 Apr 2009 13:46

Al Hartman wrote: "I don't know where it came from exactly, but I have an NTSC Spectrum.

It's labeled Sinclair, and NOT Timex/Sinclair.

I don't know where Stuart got it from, except possibly from Timex
Portugal or from his contact who bought a warehouse full of Timex
stock which were returns from Deptartment stores and the like."

Hi Al.

Although some of us already have European Spectrums connected to Multi-System TVs or PC video capture cards, the mistery remains. We know it needed more than one NTSC TV modulator to work over here. I would like to know if the ULA is different and what's written on top of it (because the video signal originates there first), how did they solve the timing issues, etc.

I dedicated many hours to search engines trying to find information about NTSC ZX Spectrums in the U.S. and Chile. It seems you're our only hope for answers...

Could you please, at some point, provide a picture of the board of that Spectrum for us to study? It won't give us all the answers, but it will provide clues and satisfy our curiosity.

2. Re: [ts2068] re: NTSC Spectrum

Jack Boatwright · Sun, 5 Apr 2009 12:12:

fwiw,

In some of the early paper items I have I noticed that English Micro Connection (EMC) was offering Spectrums along with IF1 and Microdrive(s) for sale at one time.  If memory serves EMC was located in Connecticut.  The adverts don't say specifically NTSC but, again reverting to memory, I seem to remembers words indicating they worked in the US.

I think EMC was involved with Zebra in importing the TC2068 (silver avenger) and FDD/FDD3000 systems from Portugal.

Jack


  ----- Original Message ----- 
  From: zxbruno 
  To: [email] 
  Sent: Sunday, April 05, 2009 6:46 AM
  Subject: [ts2068] re: NTSC Spectrum


  Al Hartman wrote: "I don't know where it came from exactly, but I have an NTSC Spectrum.

  It's labeled Sinclair, and NOT Timex/Sinclair.

  I don't know where Stuart got it from, except possibly from Timex
  Portugal or from his contact who bought a warehouse full of Timex
  stock which were returns from Deptartment stores and the like."

  Hi Al.

  Although some of us already have European Spectrums connected to Multi-System TVs or PC video capture cards, the mistery remains. We know it needed more than one NTSC TV modulator to work over here. I would like to know if the ULA is different and what's written on top of it (because the video signal originates there first), how did they solve the timing issues, etc.

  I dedicated many hours to search engines trying to find information about NTSC ZX Spectrums in the U.S. and Chile. It seems you're our only hope for answers...

  Could you please, at some point, provide a picture of the board of that Spectrum for us to study? It won't give us all the answers, but it will provide clues and satisfy our curiosity.

3. Re: [ts2068] re: NTSC Spectrum

Claudio Bernet · Sun, 5 Apr 2009 18:12: · 📎 4: file, file, file, file

Hi all,

In order to help zxbruno, this are photos of my NTSC speccy (48k).

I'am from Chile (excuse my lack of english)... I have two ntsc speccys: my old one modded with a kempston port (photos) and another mint one for my collection.

In Chile, mid-80's, the zx-spectrum was not a very succesful machine in the markets, but a few ones love it. Atari 8 bit line was the winner in those days. I think in my country were imported about 5000 48k ntsc speccys... later, Sinclair Chile imported the Timex Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS 2068, but  thats a different machine as all we know.

Well, hope this help this great group to find some answers.

Don't bother to ask me some questions.

Good waves from  Chile.

Claudio

 



--- On Sun, 4/5/09, zxbruno <[email]> wrote:
From: zxbruno <[email]>
Subject: [ts2068] re: NTSC Spectrum
To: [email]
Date: Sunday, April 5, 2009, 4:46 PM












            Al Hartman wrote: "I don't know where it came from exactly, but I have an NTSC Spectrum.



It's labeled Sinclair, and NOT Timex/Sinclair.



I don't know where Stuart got it from, except possibly from Timex

Portugal or from his contact who bought a warehouse full of Timex

stock which were returns from Deptartment stores and the like."



Hi Al.



Although some of us already have European Spectrums connected to Multi-System TVs or PC video capture cards, the mistery remains. We know it needed more than one NTSC TV modulator to work over here. I would like to know if the ULA is different and what's written on top of it (because the video signal originates there first), how did they solve the timing issues, etc.



I dedicated many hours to search engines trying to find information about NTSC ZX Spectrums in the U.S. and Chile. It seems you're our only hope for answers...



Could you please, at some point, provide a picture of the board of that Spectrum for us to study? It won't give us all the answers, but it will provide clues and satisfy our curiosity.

4. Re: NTSC Spectrum

zxbruno · Mon, 06 Apr 2009 01:26

Hi Claudio!
I can't believe that I'm so close to actually seeing a 48K NTSC Spectrum!!
¡Yo hablo español también, y me encantaría que hablaramos por e-mail!
I speak Spanish too, and I would love to be able to get in touch via e-mail!

Las fotos que querías compartir no se quedaron guardadas en Yahoo. :( Tienes que ir al hilo "photos" y envialas para que se queden en el archivo del grupo, o puedes enviarlas a [email] y me encargaré de que todos en el grupo puedan verlas. Nos gustaría ver fotos de afuera de los dos modelos, pero principalmente de la parte de adentro, porque hasta hoy no hay nadie que sepa como es un Spectrum NTSC por dentro. Creeme, la comunidad mundial del Spectrum ha estado esperando esto por muchos años..

The pictures you wanted to share didn't get saved when you sent them to the Yahoo group. :( You have to click the "photos" link on the left and upload them, or you could send them directly to [email] and I'll make sure everyone in the group can see them. We would like to see the pictures of how it looks on the outside, but especially the inside. Because until today the Sinclair community hasn't found out how they work and look inside. Believe me, the worldwide Sinclair community has been waiting for this for many years...

--- In [email], Claudio Bernet <cbernetp@...> wrote:
>
> Hi all,
> 
> In order to help zxbruno, this are photos of my NTSC speccy (48k).
> 
> I'am from Chile (excuse my lack of english)... I have two ntsc speccys: my old one modded with a kempston port (photos) and another mint one for my collection.
> 
> In Chile, mid-80's, the zx-spectrum was not a very succesful machine in the markets, but a few ones love it. Atari 8 bit line was the winner in those days. I think in my country were imported about 5000 48k ntsc speccys... later, Sinclair Chile imported the Timex Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS 2068, but  thats a different machine as all we know.
> 
> Well, hope this help this great group to find some answers.
> 
> Don't bother to ask me some questions.
> 
> Good waves from  Chile.
> 
> Claudio
> 
>  
> 
> 
> 
> --- On Sun, 4/5/09, zxbruno <zxspectrum128@...> wrote:
> From: zxbruno <zxspectrum128@...>
> Subject: [ts2068] re: NTSC Spectrum
> To: [email]
> Date: Sunday, April 5, 2009, 4:46 PM
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
>     
>             Al Hartman wrote: "I don't know where it came from exactly, but I have an NTSC Spectrum.
> 
> 
> 
> It's labeled Sinclair, and NOT Timex/Sinclair.
> 
> 
> 
> I don't know where Stuart got it from, except possibly from Timex
> 
> Portugal or from his contact who bought a warehouse full of Timex
> 
> stock which were returns from Deptartment stores and the like."
> 
> 
> 
> Hi Al.
> 
> 
> 
> Although some of us already have European Spectrums connected to Multi-System TVs or PC video capture cards, the mistery remains. We know it needed more than one NTSC TV modulator to work over here. I would like to know if the ULA is different and what's written on top of it (because the video signal originates there first), how did they solve the timing issues, etc.
> 
> 
> 
> I dedicated many hours to search engines trying to find information about NTSC ZX Spectrums in the U.S. and Chile. It seems you're our only hope for answers...
> 
> 
> 
> Could you please, at some point, provide a picture of the board of that Spectrum for us to study? It won't give us all the answers, but it will provide clues and satisfy our curiosity.
>

5. Re: [ts2068] re: NTSC Spectrum

Don Dindang · Mon, 6 Apr 2009 00:08:

Hi,

6. Re: [ts2068] re: NTSC Spectrum

Hernán Pablo Alvarez · Mon, 6 Apr 2009 09:40:

Hi!

The Czerweny CZ 2000 was imported to Argentina from Portugal, probably made
by Timex. It has a 3,5 MHz oscillator but it isn't NTSC, it's PAL-N as we
use here in Argentina.

Also the 14-pin chip is a SN-I don't remember the number :-P from Texas
Instruments, and it's used also in some standard british PAL-I Spectrums.

--
Hernán Alvarez
[email]


2009/4/6 Don Dindang <[email]>

>   Hi,
>
> From the picture it use ZX Spectrum issue 6A board. But it change the IC
> for decoding NTSC to another one (I cannot read the number, it has only 14
> pins), instead of LM1889. The crystal also was changed to 3.579 MHz. ULA
> number is ULA6C011E-3 year 84.
>
> I just upload the picture of CZERWENTY CZ 2000, this spectrum colne also
> work with NTSC at CH 12. It also use ZX Spectrum issur 6A board. But for
> NTSC decoder it use the same as original spectrum, LM1889 with 3.579 MHz
> crystal. The ULA nukber is ULA6C001E-7
>
> Don
>
>
>
> --- On *Sun, 4/5/09, Claudio Bernet <[email]>* wrote:
>
>
> From: Claudio Bernet <[email]>
> Subject: Re: [ts2068] re: NTSC Spectrum
> To: [email]
> Date: Sunday, April 5, 2009, 6:12 PM
>
>  Hi all,
>
> In order to help zxbruno, this are photos of my NTSC speccy (48k).
>
> I'am from Chile (excuse my lack of english)... I have two ntsc speccys: my
> old one modded with a kempston port (photos) and another mint one for my
> collection.
>
> In Chile, mid-80's, the zx-spectrum was not a very succesful machine in the
> markets, but a few ones love it. Atari 8 bit line was the winner in those
> days. I think in my country were imported about 5000 48k ntsc speccys...
> later, Sinclair Chile imported the Timex Computer 2048 and the brazilian
> TK90X. Obviuosly, the silver TS 2068, but  thats a different machine as all
> we know.
>
> Well, hope this help this great group to find some answers.
>
> Don't bother to ask me some questions.
>
> Good waves from  Chile.
>
> Claudio
>
>
>
>
>
> --- On *Sun, 4/5/09, zxbruno <zxspectrum128@ gmail.com>* wrote:
>
> From: zxbruno <zxspectrum128@ gmail.com>
> Subject: [ts2068] re: NTSC Spectrum
> To: ts2068@yahoogroups. com
> Date: Sunday, April 5, 2009, 4:46 PM
>
>  Al Hartman wrote: "I don't know where it came from exactly, but I have an
> NTSC Spectrum.
>
> It's labeled Sinclair, and NOT Timex/Sinclair.
>
> I don't know where Stuart got it from, except possibly from Timex
> Portugal or from his contact who bought a warehouse full of Timex
> stock which were returns from Deptartment stores and the like."
>
> Hi Al.
>
> Although some of us already have European Spectrums connected to
> Multi-System TVs or PC video capture cards, the mistery remains. We know it
> needed more than one NTSC TV modulator to work over here. I would like to
> know if the ULA is different and what's written on top of it (because the
> video signal originates there first), how did they solve the timing issues,
> etc.
>
> I dedicated many hours to search engines trying to find information about
> NTSC ZX Spectrums in the U.S. and Chile. It seems you're our only hope for
> answers...
>
> Could you please, at some point, provide a picture of the board of that
> Spectrum for us to study? It won't give us all the answers, but it will
> provide clues and satisfy our curiosity.
>
>
>
>  
>

7. Re: [ts2068] re: NTSC Spectrum

Oscar Arthur Koepke · Mon, 6 Apr 2009 08:25:

Hi There, Claudio.

I'm from Brazil and I have 2(units) of Sinclair ZX Spectrum48k but can't put it to work because they are bolth from UK in PAG_I(PAL-G) channel 36 UHF I Have found a way to get videocomposite out but still in PAL-G.
Here in Brazil we have TV sets with tri video sistems NTSC(from USA), PAL-M(BRAZIL) and PAL-N(from Uruguay and Argentina). 
So you NTSC modification will work fine around here...

Can you give a closer photo shot(CloseUP) from the inside of the RF shilded box from your Speccy48k?
Have you some schematics(from the Circuits) from these modifications(both TV NTSC output and KempstoneJoystick) to share with all users from the Group here in Yahoo! ??

Thanks,

OSCAR KOEPKE
BRAZIL

--- On Sun, 4/5/09, Claudio Bernet <[email]> wrote:

From: Claudio Bernet <[email]>
Subject: Re: [ts2068] re: NTSC Spectrum
To: [email]
Date: Sunday, April 5, 2009, 10:12 PM












            Hi all,

In order to help zxbruno, this are photos of my NTSC speccy (48k).

I'am from Chile (excuse my lack of english)... I have two ntsc speccys: my old one modded with a kempston port (photos) and another mint one for my collection.

In Chile, mid-80's, the zx-spectrum was not a very succesful machine in the markets, but a few ones love it. Atari 8 bit line was the winner in those days. I think in my country were imported about 5000 48k ntsc speccys... later, Sinclair Chile imported the Timex Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS 2068, but  thats a different machine as all we know.

Well, hope this help this great group to find some answers.

Don't bother to ask me some questions.

Good waves from  Chile.

Claudio

 



--- On Sun, 4/5/09, zxbruno
 <zxspectrum128@ gmail.com> wrote:
From: zxbruno <zxspectrum128@ gmail.com>
Subject: [ts2068] re: NTSC Spectrum
To: ts2068@yahoogroups. com
Date: Sunday, April 5, 2009, 4:46 PM









            Al Hartman wrote: "I don't know where it came from exactly, but I have an NTSC Spectrum.



It's labeled Sinclair, and NOT Timex/Sinclair.



I don't know where Stuart got it from, except possibly from Timex

Portugal or from his contact who bought a warehouse full of Timex

stock which were returns from Deptartment stores and the like."



Hi Al.



Although some of us already have European Spectrums connected to Multi-System TVs or PC video capture cards, the mistery remains. We know it needed more than one NTSC TV modulator to work over here. I would like to know if the ULA is different and what's written on top of it (because the video signal originates there first), how did they solve the timing issues, etc.



I dedicated many hours to search engines trying to find information about NTSC ZX Spectrums in the U.S. and Chile. It seems you're our only hope for answers...



Could you please, at some point, provide a picture of the board of that Spectrum for us to study? It won't give us all the answers, but it will provide clues and satisfy our curiosity.

8. Re: [ts2068] re: NTSC Spectrum

Hernán Pablo Alvarez · Mon, 6 Apr 2009 12:37:

The TI chip is a *SN94459N*, it's pin compatible to the LM1889 even having
14-pin only.

It was used in a lot of issue 6A Speccys and it's a common cause of failure,
displaying only black and white video. I had one and replaced it with the
more common and reliable LM1889.

--
Hernán Alvarez
[email]


2009/4/6 Oscar Arthur Koepke <[email]>

>   Hi There, Claudio.
>
> I'm from Brazil and I have 2(units) of Sinclair ZX Spectrum48k but can't
> put it to work because they are bolth from UK in PAG_I(PAL-G) channel 36 UHF
> I Have found a way to get videocomposite out but still in PAL-G.
> Here in Brazil we have TV sets with tri video sistems NTSC(from USA),
> PAL-M(BRAZIL) and PAL-N(from Uruguay and Argentina).
> So you NTSC modification will work fine around here...
>
> Can you give a closer photo shot(CloseUP) from the inside of the RF shilded
> box from your Speccy48k?
> Have you some schematics(from the Circuits) from these modifications(both
> TV NTSC output and KempstoneJoystick) to share with all users from the Group
> here in Yahoo! ??
>
> Thanks,
>
> OSCAR KOEPKE
> BRAZIL
>
> --- On *Sun, 4/5/09, Claudio Bernet <[email]>* wrote:
>
>
> From: Claudio Bernet <[email]>
> Subject: Re: [ts2068] re: NTSC Spectrum
> To: [email]
> Date: Sunday, April 5, 2009, 10:12 PM
>
>  Hi all,
>
> In order to help zxbruno, this are photos of my NTSC speccy (48k).
>
> I'am from Chile (excuse my lack of english)... I have two ntsc speccys: my
> old one modded with a kempston port (photos) and another mint one for my
> collection.
>
> In Chile, mid-80's, the zx-spectrum was not a very succesful machine in the
> markets, but a few ones love it. Atari 8 bit line was the winner in those
> days. I think in my country were imported about 5000 48k ntsc speccys...
> later, Sinclair Chile imported the Timex Computer 2048 and the brazilian
> TK90X. Obviuosly, the silver TS 2068, but  thats a different machine as all
> we know.
>
> Well, hope this help this great group to find some answers.
>
> Don't bother to ask me some questions.
>
> Good waves from  Chile.
>
> Claudio
>
>
>
>
>
> --- On *Sun, 4/5/09, zxbruno <zxspectrum128@ gmail.com>* wrote:
>
> From: zxbruno <zxspectrum128@ gmail.com>
> Subject: [ts2068] re: NTSC Spectrum
> To: ts2068@yahoogroups. com
> Date: Sunday, April 5, 2009, 4:46 PM
>
>  Al Hartman wrote: "I don't know where it came from exactly, but I have an
> NTSC Spectrum.
>
> It's labeled Sinclair, and NOT Timex/Sinclair.
>
> I don't know where Stuart got it from, except possibly from Timex
> Portugal or from his contact who bought a warehouse full of Timex
> stock which were returns from Deptartment stores and the like."
>
> Hi Al.
>
> Although some of us already have European Spectrums connected to
> Multi-System TVs or PC video capture cards, the mistery remains. We know it
> needed more than one NTSC TV modulator to work over here. I would like to
> know if the ULA is different and what's written on top of it (because the
> video signal originates there first), how did they solve the timing issues,
> etc.
>
> I dedicated many hours to search engines trying to find information about
> NTSC ZX Spectrums in the U.S. and Chile. It seems you're our only hope for
> answers...
>
> Could you please, at some point, provide a picture of the board of that
> Spectrum for us to study? It won't give us all the answers, but it will
> provide clues and satisfy our curiosity.
>
>
>
>  
>

9. Re: [ts2068] re: NTSC Spectrum

Claudio Bernet · Mon, 6 Apr 2009 09:21:

Oscar,
 
Hello. Look, I don't know a bit about electronics, but note that the TV output is not modded, this model was constructed with NTSC output. The kempton port is a mod, maded 15 years ago, don't have schematics of that, but I think it's a simple mod, sure you can find some googling.
 
I will take some shots of the RF interior this night, if someone here need a special take please just post here.
 
Regards
Claudio
 


--- On Mon, 4/6/09, Oscar Arthur Koepke <[email]> wrote:

From: Oscar Arthur Koepke <[email]>
Subject: Re: [ts2068] re: NTSC Spectrum
To: [email], "Claudio Bernet" <[email]>
Date: Monday, April 6, 2009, 6:25 PM










Hi There, Claudio.

I'm from Brazil and I have 2(units) of Sinclair ZX Spectrum48k but can't put it to work because they are bolth from UK in PAG_I(PAL-G) channel 36 UHF I Have found a way to get videocomposite out but still in PAL-G.
Here in Brazil we have TV sets with tri video sistems NTSC(from USA), PAL-M(BRAZIL) and PAL-N(from Uruguay and Argentina). 
So you NTSC modification will work fine around here...

Can you give a closer photo shot(CloseUP) from the inside of the RF shilded box from your Speccy48k?
Have you some schematics(from the Circuits) from these modifications( both TV NTSC output and KempstoneJoystick) to share with all users from the Group here in Yahoo! ??

Thanks,

OSCAR KOEPKE
BRAZIL

--- On Sun, 4/5/09, Claudio Bernet <cbernetp@yahoo. com> wrote:


From: Claudio Bernet <cbernetp@yahoo. com>
Subject: Re: [ts2068] re: NTSC Spectrum
To: ts2068@yahoogroups. com
Date: Sunday, April 5, 2009, 10:12 PM








Hi all,

In order to help zxbruno, this are photos of my NTSC speccy (48k).

I'am from Chile (excuse my lack of english)... I have two ntsc speccys: my old one modded with a kempston port (photos) and another mint one for my collection.

In Chile, mid-80's, the zx-spectrum was not a very succesful machine in the markets, but a few ones love it. Atari 8 bit line was the winner in those days. I think in my country were imported about 5000 48k ntsc speccys... later, Sinclair Chile imported the Timex Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS 2068, but  thats a different machine as all we know.

Well, hope this help this great group to find some answers.

Don't bother to ask me some questions.

Good waves from  Chile.

Claudio

 



--- On Sun, 4/5/09, zxbruno <zxspectrum128@ gmail.com> wrote:

From: zxbruno <zxspectrum128@ gmail.com>
Subject: [ts2068] re: NTSC Spectrum
To: ts2068@yahoogroups. com
Date: Sunday, April 5, 2009, 4:46 PM




Al Hartman wrote: "I don't know where it came from exactly, but I have an NTSC Spectrum.

It's labeled Sinclair, and NOT Timex/Sinclair.

I don't know where Stuart got it from, except possibly from Timex
Portugal or from his contact who bought a warehouse full of Timex
stock which were returns from Deptartment stores and the like."

Hi Al.

Although some of us already have European Spectrums connected to Multi-System TVs or PC video capture cards, the mistery remains. We know it needed more than one NTSC TV modulator to work over here. I would like to know if the ULA is different and what's written on top of it (because the video signal originates there first), how did they solve the timing issues, etc.

I dedicated many hours to search engines trying to find information about NTSC ZX Spectrums in the U.S. and Chile. It seems you're our only hope for answers...

Could you please, at some point, provide a picture of the board of that Spectrum for us to study? It won't give us all the answers, but it will provide clues and satisfy our curiosity.

10. Re: [ts2068] re: NTSC Spectrum

Don Dindang · Mon, 6 Apr 2009 11:03:

(no text — see archive.org)

11. Re: NTSC Spectrum

zxbruno · Mon, 06 Apr 2009 23:17

Oh my, oh my!! Thank you for the pictures!!!
So, based on what we know now, is it easy to mod any european Sinclair machine to make it work in the U.S. without Multi-System TVs or video capture cards? Or do we still have a problem with the ULA?

Claudio, is there anything on that box or in the back or bottom of the 48K to suggest that something was done to it to make it NTSC compatible? Or does everything look exactly like the european version when you first look at it?

Is there any way of buying these from people in Chile? If I could get my hands in one I would send it to a friend here in the U.S. or a friend in Spain who could "reverse engineer" the whole thing and document it online.

12. Re: NTSC Spectrum

cheveron · Tue, 07 Apr 2009 06:28

Al Hartman wrote: "I don't know where it came from exactly, but I have an NTSC Spectrum.

Sinclair offered the Spectrum for sale in the U.S. by mail-order. This may be the first report of one of these ultra-rare machines. The other clue is in the original Spectrum manual which includes changes to make to some of the example programs if you have a 60hz (US) machine.

13. Re: NTSC Spectrum

zxbruno · Tue, 07 Apr 2009 07:24

--- In [email], "cheveron@..." <cheveron@...> wrote:
>
> Al Hartman wrote: "I don't know where it came from exactly, but I have an NTSC Spectrum.
> 
> Sinclair offered the Spectrum for sale in the U.S. by mail-order. This may be the first report of one of these ultra-rare machines. The other clue is in the original Spectrum manual which includes changes to make to some of the example programs if you have a 60hz (US) machine.
>

And all searches for "English Micro Connection" in Rhode Island and/or Connecticut reveal nothing. :) So, unless we find answers from former Sinclair people, I'm going to assume the rare machines were the same ones that were sent to (or made in) Chile.

14. RE: [ts2068] Re: NTSC Spectrum

Bill Loguidice · Tue, 7 Apr 2009 09:25:

That would be historically interesting if that were true, so if anyone has
any of these mail order advertisements from Sinclair for the Spectrum, I'd
love to see it (as I'm sure others would too). I'm not saying it's not true,
but I have my doubts because of the exclusive distribution relationship with
Timex. As far as I know, the only time Sinclair was in the US was with the
ZX80/81 and then not again until the QL, though again, I'd love to see
otherwise.

====================================================
Bill Loguidice, Managing Director
Armchair Arcade, Inc.
 <http://www.armchairarcade.com/> http://www.armchairarcade.com
A PC Magazine Top 100 Website
====================================================
Authored Books:  <http://www.armchairarcade.com/books>
http://www.armchairarcade.com/books
====================================================
LinkedIn: http://www.linkedin.com/in/billloguidice
====================================================



  _____  

From: [email] [mailto:[email]] On Behalf Of
[email]
Sent: Tuesday, April 07, 2009 2:28 AM
To: [email]
Subject: [ts2068] Re: NTSC Spectrum



Al Hartman wrote: "I don't know where it came from exactly, but I have an
NTSC Spectrum.

Sinclair offered the Spectrum for sale in the U.S. by mail-order. This may
be the first report of one of these ultra-rare machines. The other clue is
in the original Spectrum manual which includes changes to make to some of
the example programs if you have a 60hz (US) machine.

15. Re: NTSC Spectrum

Al Hartman · Tue, 07 Apr 2009 15:44

Nope, not going to take apart this rare, possibly one-of-a-kind unit to 
take pictures of the logic board. Sorry.

And, nope... EMC had NOTHING to do with Zebra importing Timex Portugal 
products. It was actually an American aircraft company that brokered the 
deal. They wanted to sell Portugal some aircraft and they needed to 
balance that trade with American companies importing Portugese products. 
I took the call myself.

EMC and Zebra had a relationship, but it wasn't particularly close. EMC 
promised to import Interface Ones and Micro Drives along with twister 
boards for the TS2068. As far as I know, Zebra was the only company to 
make twister boards in volume commercially, and mainly to support the 
use of the FDD systems on TS2068s.

I was pushing for a Super Twister which had a Spectrum ROM, Parallel 
Port and VGA output on board. But due to problems with the VGA port, it 
never got out of prototype stage. Mainly because the person who laid out 
the board for us used traces too thin to carry the signals reliably. The 
market was too small to justify the funds to have the board redone from 
scratch.

While I don't have an FDD system, I have an Interface One and Micro 
Drive for my Spectrum as well as the interface unit for the FDD (Black 
with a Spectrum ROM, rather than the silver 2068 ROMmed units).

I don't even know where the Spectrum is at this time. It's in a box in 
my closet somewhere. I know where the Interface One and Microdrive is... 
But that's it.

Al

16. Re: NTSC Spectrum

cheveron · Tue, 07 Apr 2009 19:16

I've no evidence Sinclair ever actually sold the Spectrum by mail-order in the US, but I understand from conversations I've had with ex-Sinclair employees that the contract Sinclair had with Timex did not prohibit it from selling direct via mail-order, and that a 60Mhz version was developed in-house (as alluded to in the BASIC manual).

--- In [email], "Bill Loguidice" <bill@...> wrote:
>
> That would be historically interesting if that were true, so if anyone has
> any of these mail order advertisements from Sinclair for the Spectrum, I'd
> love to see it (as I'm sure others would too). I'm not saying it's not true,
> but I have my doubts because of the exclusive distribution relationship with
> Timex. As far as I know, the only time Sinclair was in the US was with the
> ZX80/81 and then not again until the QL, though again, I'd love to see
> otherwise.
>  
> ====================================================
> Bill Loguidice, Managing Director
> Armchair Arcade, Inc.
>  <http://www.armchairarcade.com/> http://www.armchairarcade.com
> A PC Magazine Top 100 Website
> ====================================================
> Authored Books:  <http://www.armchairarcade.com/books>
> http://www.armchairarcade.com/books
> ====================================================
> LinkedIn: http://www.linkedin.com/in/billloguidice
> ====================================================
> 
>  
> 
>   _____  
> 
> From: [email] [mailto:[email]] On Behalf Of
> cheveron@...
> Sent: Tuesday, April 07, 2009 2:28 AM
> To: [email]
> Subject: [ts2068] Re: NTSC Spectrum
> 
> 
> 
> Al Hartman wrote: "I don't know where it came from exactly, but I have an
> NTSC Spectrum.
> 
> Sinclair offered the Spectrum for sale in the U.S. by mail-order. This may
> be the first report of one of these ultra-rare machines. The other clue is
> in the original Spectrum manual which includes changes to make to some of
> the example programs if you have a 60hz (US) machine.
>

17. Re: [ts2068] Re: NTSC Spectrum

Jack Boatwright · Tue, 7 Apr 2009 17:16:

I have a catalog (not at my fingertips) from EMC that advertized Speccys for sale.  I'm not saying that any were delivered, though.  I'll have to try to find it again..

  ----- Original Message ----- 
  From: Bill Loguidice 
  To: [email] 
  Sent: Tuesday, April 07, 2009 6:25 AM
  Subject: RE: [ts2068] Re: NTSC Spectrum



  That would be historically interesting if that were true, so if anyone has any of these mail order advertisements from Sinclair for the Spectrum, I'd love to see it (as I'm sure others would too). I'm not saying it's not true, but I have my doubts because of the exclusive distribution relationship with Timex. As far as I know, the only time Sinclair was in the US was with the ZX80/81 and then not again until the QL, though again, I'd love to see otherwise.

  ====================================================
  Bill Loguidice, Managing Director
  Armchair Arcade, Inc.
  http://www.armchairarcade.com
  A PC Magazine Top 100 Website
  ====================================================
  Authored Books: http://www.armchairarcade.com/books
  ====================================================
  LinkedIn: http://www.linkedin.com/in/billloguidice
  ====================================================




------------------------------------------------------------------------------
  From: [email] [mailto:[email]] On Behalf Of [email]
  Sent: Tuesday, April 07, 2009 2:28 AM
  To: [email]
  Subject: [ts2068] Re: NTSC Spectrum


  Al Hartman wrote: "I don't know where it came from exactly, but I have an NTSC Spectrum.

  Sinclair offered the Spectrum for sale in the U.S. by mail-order. This may be the first report of one of these ultra-rare machines. The other clue is in the original Spectrum manual which includes changes to make to some of the example programs if you have a 60hz (US) machine.

18. Re: NTSC Spectrum

zxbruno · Wed, 08 Apr 2009 01:51

Although it saddens me, I understand and respect your decision. I received the same type of reply from a few people who didn't trust me enough to loan me TS items, even after I offered to pay shipping both ways. But it's fine. Instead of trying to change someone's mind, I rather keep looking. :) Get ready for schematics to build your own TS1510 and TS1510 cartridges. It's going to happen. :)

I just wish Mr Stewart could drop by one day and tell us more about it, where it came from, tell us more about Zebra Systems, etc. Oh well, it doesn't hurt to dream.

--- In [email], Al Hartman <alhartman6@...> wrote:
>
> Nope, not going to take apart this rare, possibly one-of-a-kind unit to 
> take pictures of the logic board. Sorry.

19. Re: NTSC Spectrum

zxbruno · Wed, 08 Apr 2009 22:34

--- In [email], "Jack Boatwright" <jboatno4@...> wrote:
>
> I have a catalog (not at my fingertips) from EMC that advertized Speccys for sale.  I'm not saying that any were delivered, though.  I'll have to try to find it again..

Thank you Jack. That would be great. I tried to find out more about EMC, but Google isn't being my friend. All results point to you. :)

I posted the pics of Claudio's Spectrum on WOS, and this is what Chris Smith said:

"Awsome !!

ZXBruno - If you have any more details on this NTSC'ness, please send them over.

Basically, an NTSC machine does require a different ULA - one that counts through 265 lines in a frame instead of 312 for a standard PAL machine, at 60 frames a second. This is confirmed by the ULA in the machine you show being a 6C011E and not a 6C001E.

This is backed up by the two crystal values (14.110 and 3.579545 MHz)

For the technical among us: The 14.110MHz drives the ULA, which divides this by 2 and produces 443 pixels per scanline, thus: 265 * 312 / (14.110x10^6 / 2) = 60Hz

The 3.579545 MHz crystal produces the NTSC colour burst component.

So basically, what you have here is a factory produced NTSC spectrum....
It's definitely not a prototype, as the initial labour and fab costs for a ULA was quite expensive.

By the way the code on the top tells you that the ULA was manufactured between 29th Oct and 4th Nov 1984 (week 44, 1984).

Cools stuff.
Any more?

Chris
__________________
Follow The Harlequin Spectrum Clone Blog...
http://www.zxdesign.info "

For those of you who don't know Chris, he's working on a clone of the ZX Spectrum (100% compatible, not like previous clones) and also on a book about Ferranti's ULAs. For now there's no modern replacement for Spectrum ULAs, but thanks to his work that will soon change.

He wants to know more about the NTSC Spectrum, but I don't know what else to say.

Please visit http://www.zxdesign.info if you haven't done so. Hardware enthusiasts won't regret it.

20. Re: [ts2068] re: NTSC Spectrum

Fred · Thu, 9 Apr 2009 23:18:

Hi Claudio,
Are you in a position to run some test code on the Spectrum so that we  
can extract the timing details for this NTSC ULA?

Thanks,
Fred

On 07/04/2009, at 2:21, Claudio Bernet wrote:

> Oscar,
>
> Hello. Look, I don't know a bit about electronics, but note that the  
> TV output is not modded, this model was constructed with NTSC  
> output. The kempton port is a mod, maded 15 years ago, don't have  
> schematics of that, but I think it's a simple mod, sure you can find  
> some googling.
>
> I will take some shots of the RF interior this night, if someone  
> here need a special take please just post here.
>
> Regards
> Claudio
>
>
>
> --- On Mon, 4/6/09, Oscar Arthur Koepke <[email]> wrote:
> From: Oscar Arthur Koepke <[email]>
> Subject: Re: [ts2068] re: NTSC Spectrum
> To: [email], "Claudio Bernet" <[email]>
> Date: Monday, April 6, 2009, 6:25 PM
>
> Hi There, Claudio.
>
> I'm from Brazil and I have 2(units) of Sinclair ZX Spectrum48k but  
> can't put it to work because they are bolth from UK in PAG_I(PAL-G)  
> channel 36 UHF I Have found a way to get videocomposite out but  
> still in PAL-G.
> Here in Brazil we have TV sets with tri video sistems NTSC(from  
> USA), PAL-M(BRAZIL) and PAL-N(from Uruguay and Argentina).
> So you NTSC modification will work fine around here...
>
> Can you give a closer photo shot(CloseUP) from the inside of the RF  
> shilded box from your Speccy48k?
> Have you some schematics(from the Circuits) from these  
> modifications( both TV NTSC output and KempstoneJoystick) to share  
> with all users from the Group here in Yahoo! ??
>
> Thanks,
>
> OSCAR KOEPKE
> BRAZIL
>
> --- On Sun, 4/5/09, Claudio Bernet <cbernetp@yahoo. com> wrote:
>
> From: Claudio Bernet <cbernetp@yahoo. com>
> Subject: Re: [ts2068] re: NTSC Spectrum
> To: ts2068@yahoogroups. com
> Date: Sunday, April 5, 2009, 10:12 PM
>
> Hi all,
>
> In order to help zxbruno, this are photos of my NTSC speccy (48k).
>
> I'am from Chile (excuse my lack of english)... I have two ntsc  
> speccys: my old one modded with a kempston port (photos) and another  
> mint one for my collection.
>
> In Chile, mid-80's, the zx-spectrum was not a very succesful machine  
> in the markets, but a few ones love it. Atari 8 bit line was the  
> winner in those days. I think in my country were imported about 5000  
> 48k ntsc speccys... later, Sinclair Chile imported the Timex  
> Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS  
> 2068, but  thats a different machine as all we know.
>
> Well, hope this help this great group to find some answers.
>
> Don't bother to ask me some questions.
>
> Good waves from  Chile.
>
> Claudio
>
>
>
>
>
> --- On Sun, 4/5/09, zxbruno <zxspectrum128@ gmail.com> wrote:
> From: zxbruno <zxspectrum128@ gmail.com>
> Subject: [ts2068] re: NTSC Spectrum
> To: ts2068@yahoogroups. com
> Date: Sunday, April 5, 2009, 4:46 PM
>
> Al Hartman wrote: "I don't know where it came from exactly, but I  
> have an NTSC Spectrum.
>
> It's labeled Sinclair, and NOT Timex/Sinclair.
>
> I don't know where Stuart got it from, except possibly from Timex
> Portugal or from his contact who bought a warehouse full of Timex
> stock which were returns from Deptartment stores and the like."
>
> Hi Al.
>
> Although some of us already have European Spectrums connected to  
> Multi-System TVs or PC video capture cards, the mistery remains. We  
> know it needed more than one NTSC TV modulator to work over here. I  
> would like to know if the ULA is different and what's written on top  
> of it (because the video signal originates there first), how did  
> they solve the timing issues, etc.
>
> I dedicated many hours to search engines trying to find information  
> about NTSC ZX Spectrums in the U.S. and Chile. It seems you're our  
> only hope for answers...
>
> Could you please, at some point, provide a picture of the board of  
> that Spectrum for us to study? It won't give us all the answers, but  
> it will provide clues and satisfy our curiosity.
>
>
>
>
>
>
>

21. Re: [ts2068] re: NTSC Spectrum

Claudio Bernet · Thu, 9 Apr 2009 07:49:

Fred,
 
I dont know a bit about electronics and nothing about z80 programming. But, if you send me some program to run, surely I can help. I have time this weekend.
 
If you need some more shots or what ever that may help, just ask.
 
Regards
Claudio
 
 
 
 


--- On Thu, 4/9/09, Fred <[email]> wrote:

From: Fred <[email]>
Subject: Re: [ts2068] re: NTSC Spectrum
To: [email]
Date: Thursday, April 9, 2009, 4:18 PM








Hi Claudio,
Are you in a position to run some test code on the Spectrum so that we 
can extract the timing details for this NTSC ULA?

Thanks,
Fred

On 07/04/2009, at 2:21, Claudio Bernet wrote:

> Oscar,
>
> Hello. Look, I don't know a bit about electronics, but note that the 
> TV output is not modded, this model was constructed with NTSC 
> output. The kempton port is a mod, maded 15 years ago, don't have 
> schematics of that, but I think it's a simple mod, sure you can find 
> some googling.
>
> I will take some shots of the RF interior this night, if someone 
> here need a special take please just post here.
>
> Regards
> Claudio
>
>
>
> --- On Mon, 4/6/09, Oscar Arthur Koepke <oscarkoepke@ yahoo.com> wrote:
> From: Oscar Arthur Koepke <oscarkoepke@ yahoo.com>
> Subject: Re: [ts2068] re: NTSC Spectrum
> To: ts2068@yahoogroups. com, "Claudio Bernet" <cbernetp@yahoo. com>
> Date: Monday, April 6, 2009, 6:25 PM
>
> Hi There, Claudio.
>
> I'm from Brazil and I have 2(units) of Sinclair ZX Spectrum48k but 
> can't put it to work because they are bolth from UK in PAG_I(PAL-G) 
> channel 36 UHF I Have found a way to get videocomposite out but 
> still in PAL-G.
> Here in Brazil we have TV sets with tri video sistems NTSC(from 
> USA), PAL-M(BRAZIL) and PAL-N(from Uruguay and Argentina).
> So you NTSC modification will work fine around here...
>
> Can you give a closer photo shot(CloseUP) from the inside of the RF 
> shilded box from your Speccy48k?
> Have you some schematics(from the Circuits) from these 
> modifications( both TV NTSC output and KempstoneJoystick) to share 
> with all users from the Group here in Yahoo! ??
>
> Thanks,
>
> OSCAR KOEPKE
> BRAZIL
>
> --- On Sun, 4/5/09, Claudio Bernet <cbernetp@yahoo. com> wrote:
>
> From: Claudio Bernet <cbernetp@yahoo. com>
> Subject: Re: [ts2068] re: NTSC Spectrum
> To: ts2068@yahoogroups. com
> Date: Sunday, April 5, 2009, 10:12 PM
>
> Hi all,
>
> In order to help zxbruno, this are photos of my NTSC speccy (48k).
>
> I'am from Chile (excuse my lack of english)... I have two ntsc 
> speccys: my old one modded with a kempston port (photos) and another 
> mint one for my collection.
>
> In Chile, mid-80's, the zx-spectrum was not a very succesful machine 
> in the markets, but a few ones love it. Atari 8 bit line was the 
> winner in those days. I think in my country were imported about 5000 
> 48k ntsc speccys... later, Sinclair Chile imported the Timex 
> Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS 
> 2068, but thats a different machine as all we know.
>
> Well, hope this help this great group to find some answers.
>
> Don't bother to ask me some questions.
>
> Good waves from Chile.
>
> Claudio
>
>
>
>
>
> --- On Sun, 4/5/09, zxbruno <zxspectrum128@ gmail.com> wrote:
> From: zxbruno <zxspectrum128@ gmail.com>
> Subject: [ts2068] re: NTSC Spectrum
> To: ts2068@yahoogroups. com
> Date: Sunday, April 5, 2009, 4:46 PM
>
> Al Hartman wrote: "I don't know where it came from exactly, but I 
> have an NTSC Spectrum.
>
> It's labeled Sinclair, and NOT Timex/Sinclair.
>
> I don't know where Stuart got it from, except possibly from Timex
> Portugal or from his contact who bought a warehouse full of Timex
> stock which were returns from Deptartment stores and the like."
>
> Hi Al.
>
> Although some of us already have European Spectrums connected to 
> Multi-System TVs or PC video capture cards, the mistery remains. We 
> know it needed more than one NTSC TV modulator to work over here. I 
> would like to know if the ULA is different and what's written on top 
> of it (because the video signal originates there first), how did 
> they solve the timing issues, etc.
>
> I dedicated many hours to search engines trying to find information 
> about NTSC ZX Spectrums in the U.S. and Chile. It seems you're our 
> only hope for answers...
>
> Could you please, at some point, provide a picture of the board of 
> that Spectrum for us to study? It won't give us all the answers, but 
> it will provide clues and satisfy our curiosity.
>
>
>
>
>
>
>

22. Re: NTSC Spectrum

zxbruno · Thu, 09 Apr 2009 15:01

I'm so glad to have "found" Claudio! Thank you so much for wanting to help.

I quote a message sent to me by Chris Smith (which is working on the ULA book and the Harlequin clone):

"Chris Smith to me 
7:14 AM (36 minutes ago)

Can you get any of your known NTSC owning people to run a suite of test
programs? (see wos thread for details).

http://www.worldofspectrum.org/forums/showthread.php?t=24446

Particularly phil's fusetest.
Any other tests would be useful, should we compile a list???

Photos of the result screens would be excellent.

It would be revealing to compare the Chile machine against the US owned
prototype, to see if they are different.

A much better idea, and something that does not require opening anything!"

--- In [email], Claudio Bernet <cbernetp@...> wrote:
>
> Fred,
>  
> I dont know a bit about electronics and nothing about z80 programming. But, if you send me some program to run, surely I can help. I have time this weekend.
>  
> If you need some more shots or what ever that may help, just ask.
>  
> Regards
> Claudio
>  
>  
>  
>  
> 
> 
> --- On Thu, 4/9/09, Fred <fredm@...> wrote:
> 
> From: Fred <fredm@...>
> Subject: Re: [ts2068] re: NTSC Spectrum
> To: [email]
> Date: Thursday, April 9, 2009, 4:18 PM
> 
> 
> 
> 
> 
> 
> 
> 
> Hi Claudio,
> Are you in a position to run some test code on the Spectrum so that we 
> can extract the timing details for this NTSC ULA?
> 
> Thanks,
> Fred
> 
> On 07/04/2009, at 2:21, Claudio Bernet wrote:
> 
> > Oscar,
> >
> > Hello. Look, I don't know a bit about electronics, but note that the 
> > TV output is not modded, this model was constructed with NTSC 
> > output. The kempton port is a mod, maded 15 years ago, don't have 
> > schematics of that, but I think it's a simple mod, sure you can find 
> > some googling.
> >
> > I will take some shots of the RF interior this night, if someone 
> > here need a special take please just post here.
> >
> > Regards
> > Claudio
> >
> >
> >
> > --- On Mon, 4/6/09, Oscar Arthur Koepke <oscarkoepke@ yahoo.com> wrote:
> > From: Oscar Arthur Koepke <oscarkoepke@ yahoo.com>
> > Subject: Re: [ts2068] re: NTSC Spectrum
> > To: ts2068@yahoogroups. com, "Claudio Bernet" <cbernetp@yahoo. com>
> > Date: Monday, April 6, 2009, 6:25 PM
> >
> > Hi There, Claudio.
> >
> > I'm from Brazil and I have 2(units) of Sinclair ZX Spectrum48k but 
> > can't put it to work because they are bolth from UK in PAG_I(PAL-G) 
> > channel 36 UHF I Have found a way to get videocomposite out but 
> > still in PAL-G.
> > Here in Brazil we have TV sets with tri video sistems NTSC(from 
> > USA), PAL-M(BRAZIL) and PAL-N(from Uruguay and Argentina).
> > So you NTSC modification will work fine around here...
> >
> > Can you give a closer photo shot(CloseUP) from the inside of the RF 
> > shilded box from your Speccy48k?
> > Have you some schematics(from the Circuits) from these 
> > modifications( both TV NTSC output and KempstoneJoystick) to share 
> > with all users from the Group here in Yahoo! ??
> >
> > Thanks,
> >
> > OSCAR KOEPKE
> > BRAZIL
> >
> > --- On Sun, 4/5/09, Claudio Bernet <cbernetp@yahoo. com> wrote:
> >
> > From: Claudio Bernet <cbernetp@yahoo. com>
> > Subject: Re: [ts2068] re: NTSC Spectrum
> > To: ts2068@yahoogroups. com
> > Date: Sunday, April 5, 2009, 10:12 PM
> >
> > Hi all,
> >
> > In order to help zxbruno, this are photos of my NTSC speccy (48k).
> >
> > I'am from Chile (excuse my lack of english)... I have two ntsc 
> > speccys: my old one modded with a kempston port (photos) and another 
> > mint one for my collection.
> >
> > In Chile, mid-80's, the zx-spectrum was not a very succesful machine 
> > in the markets, but a few ones love it. Atari 8 bit line was the 
> > winner in those days. I think in my country were imported about 5000 
> > 48k ntsc speccys... later, Sinclair Chile imported the Timex 
> > Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS 
> > 2068, but thats a different machine as all we know.
> >
> > Well, hope this help this great group to find some answers.
> >
> > Don't bother to ask me some questions.
> >
> > Good waves from Chile.
> >
> > Claudio
> >
> >
> >
> >
> >
> > --- On Sun, 4/5/09, zxbruno <zxspectrum128@ gmail.com> wrote:
> > From: zxbruno <zxspectrum128@ gmail.com>
> > Subject: [ts2068] re: NTSC Spectrum
> > To: ts2068@yahoogroups. com
> > Date: Sunday, April 5, 2009, 4:46 PM
> >
> > Al Hartman wrote: "I don't know where it came from exactly, but I 
> > have an NTSC Spectrum.
> >
> > It's labeled Sinclair, and NOT Timex/Sinclair.
> >
> > I don't know where Stuart got it from, except possibly from Timex
> > Portugal or from his contact who bought a warehouse full of Timex
> > stock which were returns from Deptartment stores and the like."
> >
> > Hi Al.
> >
> > Although some of us already have European Spectrums connected to 
> > Multi-System TVs or PC video capture cards, the mistery remains. We 
> > know it needed more than one NTSC TV modulator to work over here. I 
> > would like to know if the ULA is different and what's written on top 
> > of it (because the video signal originates there first), how did 
> > they solve the timing issues, etc.
> >
> > I dedicated many hours to search engines trying to find information 
> > about NTSC ZX Spectrums in the U.S. and Chile. It seems you're our 
> > only hope for answers...
> >
> > Could you please, at some point, provide a picture of the board of 
> > that Spectrum for us to study? It won't give us all the answers, but 
> > it will provide clues and satisfy our curiosity.
> >
> >
> >
> >
> >
> >
> >
>

23. Re: [ts2068] Re: NTSC Spectrum

Oscar Arthur Koepke · Thu, 9 Apr 2009 13:43:

The ULA from both systems is the same... 

It don't get tv signal it is outside the ULA like LM18xx. 
The secret is the XTAL cristal frequency and some minor adjustments to get a channel in VHF not UHF.

ULA give you VIEDOCOMPONENT SIGNALS not even RGB or RF signals its all outside the chip near the RF Shielded box or even inside...(in normal ZX Spectrum48Kb PAL-G the signal that gos to the BOX is VIDEOCOMPOSITE signal in PAL-G).



--- On Thu, 4/9/09, zxbruno <[email]> wrote:

From: zxbruno <[email]>
Subject: [ts2068] Re: NTSC Spectrum
To: [email]
Date: Thursday, April 9, 2009, 12:01 PM

















      I'm so glad to have "found" Claudio! Thank you so much for wanting to help.



I quote a message sent to me by Chris Smith (which is working on the ULA book and the Harlequin clone):



"Chris Smith to me 

7:14 AM (36 minutes ago)



Can you get any of your known NTSC owning people to run a suite of test

programs? (see wos thread for details).



http://www.worldofs pectrum.org/ forums/showthrea d.php?t=24446



Particularly phil's fusetest.

Any other tests would be useful, should we compile a list???



Photos of the result screens would be excellent.



It would be revealing to compare the Chile machine against the US owned

prototype, to see if they are different.



A much better idea, and something that does not require opening anything!"



--- In ts2068@yahoogroups. com, Claudio Bernet <cbernetp@.. .> wrote:

>

> Fred,

>  

> I dont know a bit about electronics and nothing about z80 programming. But, if you send me some program to run, surely I can help. I have time this weekend.

>  

> If you need some more shots or what ever that may help, just ask.

>  

> Regards

> Claudio

>  

>  

>  

>  

> 

> 

> --- On Thu, 4/9/09, Fred <fredm@...> wrote:

> 

> From: Fred <fredm@...>

> Subject: Re: [ts2068] re: NTSC Spectrum

> To: ts2068@yahoogroups. com

> Date: Thursday, April 9, 2009, 4:18 PM

> 

> 

> 

> 

> 

> 

> 

> 

> Hi Claudio,

> Are you in a position to run some test code on the Spectrum so that we 

> can extract the timing details for this NTSC ULA?

> 

> Thanks,

> Fred

> 

> On 07/04/2009, at 2:21, Claudio Bernet wrote:

> 

> > Oscar,

> >

> > Hello. Look, I don't know a bit about electronics, but note that the 

> > TV output is not modded, this model was constructed with NTSC 

> > output. The kempton port is a mod, maded 15 years ago, don't have 

> > schematics of that, but I think it's a simple mod, sure you can find 

> > some googling.

> >

> > I will take some shots of the RF interior this night, if someone 

> > here need a special take please just post here.

> >

> > Regards

> > Claudio

> >

> >

> >

> > --- On Mon, 4/6/09, Oscar Arthur Koepke <oscarkoepke@ yahoo.com> wrote:

> > From: Oscar Arthur Koepke <oscarkoepke@ yahoo.com>

> > Subject: Re: [ts2068] re: NTSC Spectrum

> > To: ts2068@yahoogroups. com, "Claudio Bernet" <cbernetp@yahoo. com>

> > Date: Monday, April 6, 2009, 6:25 PM

> >

> > Hi There, Claudio.

> >

> > I'm from Brazil and I have 2(units) of Sinclair ZX Spectrum48k but 

> > can't put it to work because they are bolth from UK in PAG_I(PAL-G) 

> > channel 36 UHF I Have found a way to get videocomposite out but 

> > still in PAL-G.

> > Here in Brazil we have TV sets with tri video sistems NTSC(from 

> > USA), PAL-M(BRAZIL) and PAL-N(from Uruguay and Argentina).

> > So you NTSC modification will work fine around here...

> >

> > Can you give a closer photo shot(CloseUP) from the inside of the RF 

> > shilded box from your Speccy48k?

> > Have you some schematics(from the Circuits) from these 

> > modifications( both TV NTSC output and KempstoneJoystick) to share 

> > with all users from the Group here in Yahoo! ??

> >

> > Thanks,

> >

> > OSCAR KOEPKE

> > BRAZIL

> >

> > --- On Sun, 4/5/09, Claudio Bernet <cbernetp@yahoo. com> wrote:

> >

> > From: Claudio Bernet <cbernetp@yahoo. com>

> > Subject: Re: [ts2068] re: NTSC Spectrum

> > To: ts2068@yahoogroups. com

> > Date: Sunday, April 5, 2009, 10:12 PM

> >

> > Hi all,

> >

> > In order to help zxbruno, this are photos of my NTSC speccy (48k).

> >

> > I'am from Chile (excuse my lack of english)... I have two ntsc 

> > speccys: my old one modded with a kempston port (photos) and another 

> > mint one for my collection.

> >

> > In Chile, mid-80's, the zx-spectrum was not a very succesful machine 

> > in the markets, but a few ones love it. Atari 8 bit line was the 

> > winner in those days. I think in my country were imported about 5000 

> > 48k ntsc speccys... later, Sinclair Chile imported the Timex 

> > Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS 

> > 2068, but thats a different machine as all we know.

> >

> > Well, hope this help this great group to find some answers.

> >

> > Don't bother to ask me some questions.

> >

> > Good waves from Chile.

> >

> > Claudio

> >

> >

> >

> >

> >

> > --- On Sun, 4/5/09, zxbruno <zxspectrum128@ gmail.com> wrote:

> > From: zxbruno <zxspectrum128@ gmail.com>

> > Subject: [ts2068] re: NTSC Spectrum

> > To: ts2068@yahoogroups. com

> > Date: Sunday, April 5, 2009, 4:46 PM

> >

> > Al Hartman wrote: "I don't know where it came from exactly, but I 

> > have an NTSC Spectrum.

> >

> > It's labeled Sinclair, and NOT Timex/Sinclair.

> >

> > I don't know where Stuart got it from, except possibly from Timex

> > Portugal or from his contact who bought a warehouse full of Timex

> > stock which were returns from Deptartment stores and the like."

> >

> > Hi Al.

> >

> > Although some of us already have European Spectrums connected to 

> > Multi-System TVs or PC video capture cards, the mistery remains. We 

> > know it needed more than one NTSC TV modulator to work over here. I 

> > would like to know if the ULA is different and what's written on top 

> > of it (because the video signal originates there first), how did 

> > they solve the timing issues, etc.

> >

> > I dedicated many hours to search engines trying to find information 

> > about NTSC ZX Spectrums in the U.S. and Chile. It seems you're our 

> > only hope for answers...

> >

> > Could you please, at some point, provide a picture of the board of 

> > that Spectrum for us to study? It won't give us all the answers, but 

> > it will provide clues and satisfy our curiosity.

> >

> >

> >

> >

> >

> >

> >

>

24. Re: [ts2068] Re: NTSC Spectrum

Fred · Fri, 10 Apr 2009 12:44

Hi Oscar,
I don't see how this can be true. The ULA generates the interrupts of  
which there are 50/sec in PAL land and 60/sec in NTSC land. It also  
has to generate the correct number of lines in the output image; 263  
or so in NTSC land vs 312 in PAL land.

Note this is also how the Timex clones work - the NTSC TS2068 has a  
different SCLD to the PAL TS2068/TC2048. The Timex technical spec  
describes exactly how the counters in the SCLD directly drive the  
generation of lines and times for the video output.

Unlike the ZX81 there doesn't appear to be any external configuration  
that would allow these differences to be configured in jumpers or the  
like. It appears to me that also now know that the ULA used in these  
machines are not the same ones used in the PAL versions.

I expect that producing an NTSC Spectrum involves: correct ULA,  
correct master clock (14.11MHz for NTSC, 14MHz for PAL), correct  
colour burst clock and correct video signal encoder for PAL or NTSC.

Thanks,
Fred

On 10/04/2009, at 6:43, Oscar Arthur Koepke wrote:
> The ULA from both systems is the same...
>
> It don't get tv signal it is outside the ULA like LM18xx.
> The secret is the XTAL cristal frequency and some minor adjustments  
> to get a channel in VHF not UHF.
>
> ULA give you VIEDOCOMPONENT SIGNALS not even RGB or RF signals its  
> all outside the chip near the RF Shielded box or even inside...(in  
> normal ZX Spectrum48Kb PAL-G the signal that gos to the BOX is  
> VIDEOCOMPOSITE signal in PAL-G).
>
>
>
> --- On Thu, 4/9/09, zxbruno <[email]> wrote:
>
> From: zxbruno <[email]>
> Subject: [ts2068] Re: NTSC Spectrum
> To: [email]
> Date: Thursday, April 9, 2009, 12:01 PM
>
> I'm so glad to have "found" Claudio! Thank you so much for wanting  
> to help.
>
> I quote a message sent to me by Chris Smith (which is working on the  
> ULA book and the Harlequin clone):
>
> "Chris Smith to me
> 7:14 AM (36 minutes ago)
>
> Can you get any of your known NTSC owning people to run a suite of  
> test
> programs? (see wos thread for details).
>
> http://www.worldofs pectrum.org/ forums/showthrea d.php?t=24446
>
> Particularly phil's fusetest.
> Any other tests would be useful, should we compile a list???
>
> Photos of the result screens would be excellent.
>
> It would be revealing to compare the Chile machine against the US  
> owned
> prototype, to see if they are different.
>
> A much better idea, and something that does not require opening  
> anything!"
>
> --- In ts2068@yahoogroups. com, Claudio Bernet <cbernetp@.. .> wrote:
> >
> > Fred,
> >
> > I dont know a bit about electronics and nothing about z80  
> programming. But, if you send me some program to run, surely I can  
> help. I have time this weekend.
> >
> > If you need some more shots or what ever that may help, just ask.
> >
> > Regards
> > Claudio
> >
> >
> >
> >
> >
> >
> > --- On Thu, 4/9/09, Fred <fredm@...> wrote:
> >
> > From: Fred <fredm@...>
> > Subject: Re: [ts2068] re: NTSC Spectrum
> > To: ts2068@yahoogroups. com
> > Date: Thursday, April 9, 2009, 4:18 PM
> >
> >
> >
> >
> >
> >
> >
> >
> > Hi Claudio,
> > Are you in a position to run some test code on the Spectrum so  
> that we
> > can extract the timing details for this NTSC ULA?
> >
> > Thanks,
> > Fred
> >
> > On 07/04/2009, at 2:21, Claudio Bernet wrote:
> >
> > > Oscar,
> > >
> > > Hello. Look, I don't know a bit about electronics, but note that  
> the
> > > TV output is not modded, this model was constructed with NTSC
> > > output. The kempton port is a mod, maded 15 years ago, don't have
> > > schematics of that, but I think it's a simple mod, sure you can  
> find
> > > some googling.
> > >
> > > I will take some shots of the RF interior this night, if someone
> > > here need a special take please just post here.
> > >
> > > Regards
> > > Claudio
> > >
> > >
> > >
> > > --- On Mon, 4/6/09, Oscar Arthur Koepke <oscarkoepke@ yahoo.com>  
> wrote:
> > > From: Oscar Arthur Koepke <oscarkoepke@ yahoo.com>
> > > Subject: Re: [ts2068] re: NTSC Spectrum
> > > To: ts2068@yahoogroups. com, "Claudio Bernet" <cbernetp@yahoo.  
> com>
> > > Date: Monday, April 6, 2009, 6:25 PM
> > >
> > > Hi There, Claudio.
> > >
> > > I'm from Brazil and I have 2(units) of Sinclair ZX Spectrum48k but
> > > can't put it to work because they are bolth from UK in PAG_I(PAL- 
> G)
> > > channel 36 UHF I Have found a way to get videocomposite out but
> > > still in PAL-G.
> > > Here in Brazil we have TV sets with tri video sistems NTSC(from
> > > USA), PAL-M(BRAZIL) and PAL-N(from Uruguay and Argentina).
> > > So you NTSC modification will work fine around here...
> > >
> > > Can you give a closer photo shot(CloseUP) from the inside of the  
> RF
> > > shilded box from your Speccy48k?
> > > Have you some schematics(from the Circuits) from these
> > > modifications( both TV NTSC output and KempstoneJoystick) to share
> > > with all users from the Group here in Yahoo! ??
> > >
> > > Thanks,
> > >
> > > OSCAR KOEPKE
> > > BRAZIL
> > >
> > > --- On Sun, 4/5/09, Claudio Bernet <cbernetp@yahoo. com> wrote:
> > >
> > > From: Claudio Bernet <cbernetp@yahoo. com>
> > > Subject: Re: [ts2068] re: NTSC Spectrum
> > > To: ts2068@yahoogroups. com
> > > Date: Sunday, April 5, 2009, 10:12 PM
> > >
> > > Hi all,
> > >
> > > In order to help zxbruno, this are photos of my NTSC speccy (48k).
> > >
> > > I'am from Chile (excuse my lack of english)... I have two ntsc
> > > speccys: my old one modded with a kempston port (photos) and  
> another
> > > mint one for my collection.
> > >
> > > In Chile, mid-80's, the zx-spectrum was not a very succesful  
> machine
> > > in the markets, but a few ones love it. Atari 8 bit line was the
> > > winner in those days. I think in my country were imported about  
> 5000
> > > 48k ntsc speccys... later, Sinclair Chile imported the Timex
> > > Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS
> > > 2068, but thats a different machine as all we know.
> > >
> > > Well, hope this help this great group to find some answers.
> > >
> > > Don't bother to ask me some questions.
> > >
> > > Good waves from Chile.
> > >
> > > Claudio
> > >
> > >
> > >
> > >
> > >
> > > --- On Sun, 4/5/09, zxbruno <zxspectrum128@ gmail.com> wrote:
> > > From: zxbruno <zxspectrum128@ gmail.com>
> > > Subject: [ts2068] re: NTSC Spectrum
> > > To: ts2068@yahoogroups. com
> > > Date: Sunday, April 5, 2009, 4:46 PM
> > >
> > > Al Hartman wrote: "I don't know where it came from exactly, but I
> > > have an NTSC Spectrum.
> > >
> > > It's labeled Sinclair, and NOT Timex/Sinclair.
> > >
> > > I don't know where Stuart got it from, except possibly from Timex
> > > Portugal or from his contact who bought a warehouse full of Timex
> > > stock which were returns from Deptartment stores and the like."
> > >
> > > Hi Al.
> > >
> > > Although some of us already have European Spectrums connected to
> > > Multi-System TVs or PC video capture cards, the mistery remains.  
> We
> > > know it needed more than one NTSC TV modulator to work over  
> here. I
> > > would like to know if the ULA is different and what's written on  
> top
> > > of it (because the video signal originates there first), how did
> > > they solve the timing issues, etc.
> > >
> > > I dedicated many hours to search engines trying to find  
> information
> > > about NTSC ZX Spectrums in the U.S. and Chile. It seems you're our
> > > only hope for answers...
> > >
> > > Could you please, at some point, provide a picture of the board of
> > > that Spectrum for us to study? It won't give us all the answers,  
> but
> > > it will provide clues and satisfy our curiosity.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
>
>
>
>
>
>

25. Re: [ts2068] Re: NTSC Spectrum

Timex · Fri, 10 Apr 2009 10:57

On Apr 10, 2009, at 3:44 AM, Fred wrote:

> Unlike the ZX81 there doesn't appear to be any external configuration
> that would allow these differences to be configured in jumpers or the
> like. It appears to me that also now know that the ULA used in these
> machines are not the same ones used in the PAL versions.

ZX81 is B/W so no problems.
I connected a TS1000 NTSC on my PAL B/G TV and it works.

Encarnado

26. Re: [ts2068] Re: NTSC Spectrum

Fred · Fri, 10 Apr 2009 21:13

On 10/04/2009, at 19:57, Johnny Red (Timex) wrote:
> On Apr 10, 2009, at 3:44 AM, Fred wrote:
>> Unlike the ZX81 there doesn't appear to be any external configuration
>> that would allow these differences to be configured in jumpers or the
>> like. It appears to me that also now know that the ULA used in these
>> machines are not the same ones used in the PAL versions.
>
> ZX81 is B/W so no problems.
> I connected a TS1000 NTSC on my PAL B/G TV and it works.

You are correct that colour isn't a problem, I expect that your TV is  
either multi-system or supports PAL-60. The ZX81 has a jumper to  
select 50 or 60Hz operation to select PAL or NTSC (R30 on the board).

Fred

27. Re: [ts2068] Re: NTSC Spectrum

oscarkoepke · Fri, 10 Apr 2009 04:22

Hi there Fred.

I am sure that the ULA is the SAME!! keep reading...

I have a friend here(Victor Trucco) in Brazil that have a ZX Spectrum48kb from England(UK) and he removed the content of the shilded box(see in http:// m244. photobucket. com/ albumview/albums/ vtrucco/testes/ DSC02257.jpg.html? ) and changed the XTAL cristal from 4.43..(PAL-G) to 3.575611(pal-M same nr.of lines of NTSC-M from USA and also 60Hz) and added a eletrolitic capacitor 100uF x 16V(the positive leg in the signal that goes to the box(shilded, not the ground) and the negative in the RCA female conetcor tha gives videocomposite signal out) and it works great! {see image in Mitsubishi TV set from Brazil in http://m244. photobucket.com/ albumview/albums/ vtrucco/testes/ DSC02256.jpg.html?
 )

He told me to get the NTSC signal I only need to change the Xtal crital to
 3.579545, he has a lot of
 expertise in hardware from Sinclair, MSX, Amiga, TandyColor(coco), videogames(lot from Atari2600, odyssey2,colecovision,SegaMegadrive,SegaGenesis,NES,SNES,etc.).

He recently buil a cartige emulator[with PIC processor] to use in all kind of 8bit computers(sinclair Spectrum48,MSX,atari800,C64) and videogames(odyssey2,Atari2600,Atari5200,SegaMasterSystem,gameboy) and has tutorials in the internet of how to build cartiges to use on it. 
Its a great hardware and he made one for me, still need to make the cartridges from the instructions to make mine work.

You can see the instruction to build(portuguese of course,easy to translate): cartridge for master system (sega) in http://www. instructables.com/id/Emulador_de_Cartucho_Master_System/
or cartridge for Magnavox Odyssey2 in http://www. instructables.com/id/Emulador_de_Cartucho_Odyssey/ or cartridge for MSX in http://www. instructables.com/id/Emulador_de_Cartucho_MSX/ or cartridge for TRS
 Color (coco) in http://www. instructables.com/id/Emulador_de_Cartucho_CP400/ or cable(old floppy) for the emulator in
 http://www. instructables.com/id/Cabo_para_o_Emulador_de_Cartucho/ or The Emulator itself in http://www. instructables.com/id/Emulador_de_Cartucho_Montagem/ or cartridge for Atari2600 in http:// www. instructables.com/id/Emulador_de_Cartucho_Atari_2600/ or cartridge for Sinclair Spectrum in http://www. instructables.com/id/Emulador_de_Cartucho_TK90X/

Enjoy all...

Has video in youtube also showing how it works in:
http://www. youtube.com/watch?v=sHuRIzfnXhQ&feature=channel_page
or more pictures in
http://s244. photobucket.com/albums/ gg28/vtrucco/ Emulador%20de%20Cartucho/

He knows what he is talking about....

Oscar


crital frequency (chage coma to point)
3,579545 (NTSC USA 60Hz), 3,575611 (Pal-M BRAZIL 60Hz) e 3,582056 (Pal-N Argentina and Uruguay 50Hz) 

--- On Thu, 4/9/09, Fred <[email]> wrote:

From: Fred <[email]>
Subject: Re: [ts2068] Re: NTSC Spectrum
To: [email]
Date: Thursday, April 9, 2009, 11:44 PM

















      Hi Oscar,

I don't see how this can be true. The ULA generates the interrupts of  

which there are 50/sec in PAL land and 60/sec in NTSC land. It also  

has to generate the correct number of lines in the output image; 263  

or so in NTSC land vs 312 in PAL land.



Note this is also how the Timex clones work - the NTSC TS2068 has a  

different SCLD to the PAL TS2068/TC2048. The Timex technical spec  

describes exactly how the counters in the SCLD directly drive the  

generation of lines and times for the video output.



Unlike the ZX81 there doesn't appear to be any external configuration  

that would allow these differences to be configured in jumpers or the  

like. It appears to me that also now know that the ULA used in these  

machines are not the same ones used in the PAL versions.



I expect that producing an NTSC Spectrum involves: correct ULA,  

correct master clock (14.11MHz for NTSC, 14MHz for PAL), correct  

colour burst clock and correct video signal encoder for PAL or NTSC.



Thanks,

Fred



On 10/04/2009, at 6:43, Oscar Arthur Koepke wrote:

> The ULA from both systems is the same...

>

> It don't get tv signal it is outside the ULA like LM18xx.

> The secret is the XTAL cristal frequency and some minor adjustments  

> to get a channel in VHF not UHF.

>

> ULA give you VIEDOCOMPONENT SIGNALS not even RGB or RF signals its  

> all outside the chip near the RF Shielded box or even inside...(in  

> normal ZX Spectrum48Kb PAL-G the signal that gos to the BOX is  

> VIDEOCOMPOSITE signal in PAL-G).

>

>

>

> --- On Thu, 4/9/09, zxbruno <zxspectrum128@ gmail.com> wrote:

>

> From: zxbruno <zxspectrum128@ gmail.com>

> Subject: [ts2068] Re: NTSC Spectrum

> To: ts2068@yahoogroups. com

> Date: Thursday, April 9, 2009, 12:01 PM

>

> I'm so glad to have "found" Claudio! Thank you so much for wanting  

> to help.

>

> I quote a message sent to me by Chris Smith (which is working on the  

> ULA book and the Harlequin clone):

>

> "Chris Smith to me

> 7:14 AM (36 minutes ago)

>

> Can you get any of your known NTSC owning people to run a suite of  

> test

> programs? (see wos thread for details).

>

> http://www.worldofs pectrum.org/ forums/showthrea d.php?t=24446

>

> Particularly phil's fusetest.

> Any other tests would be useful, should we compile a list???

>

> Photos of the result screens would be excellent.

>

> It would be revealing to compare the Chile machine against the US  

> owned

> prototype, to see if they are different.

>

> A much better idea, and something that does not require opening  

> anything!"

>

> --- In ts2068@yahoogroups. com, Claudio Bernet <cbernetp@.. .> wrote:

> >

> > Fred,

> >

> > I dont know a bit about electronics and nothing about z80  

> programming. But, if you send me some program to run, surely I can  

> help. I have time this weekend.

> >

> > If you need some more shots or what ever that may help, just ask.

> >

> > Regards

> > Claudio

> >

> >

> >

> >

> >

> >

> > --- On Thu, 4/9/09, Fred <fredm@...> wrote:

> >

> > From: Fred <fredm@...>

> > Subject: Re: [ts2068] re: NTSC Spectrum

> > To: ts2068@yahoogroups. com

> > Date: Thursday, April 9, 2009, 4:18 PM

> >

> >

> >

> >

> >

> >

> >

> >

> > Hi Claudio,

> > Are you in a position to run some test code on the Spectrum so  

> that we

> > can extract the timing details for this NTSC ULA?

> >

> > Thanks,

> > Fred

> >

> > On 07/04/2009, at 2:21, Claudio Bernet wrote:

> >

> > > Oscar,

> > >

> > > Hello. Look, I don't know a bit about electronics, but note that  

> the

> > > TV output is not modded, this model was constructed with NTSC

> > > output. The kempton port is a mod, maded 15 years ago, don't have

> > > schematics of that, but I think it's a simple mod, sure you can  

> find

> > > some googling.

> > >

> > > I will take some shots of the RF interior this night, if someone

> > > here need a special take please just post here.

> > >

> > > Regards

> > > Claudio

> > >

> > >

> > >

> > > --- On Mon, 4/6/09, Oscar Arthur Koepke <oscarkoepke@ yahoo.com>  

> wrote:

> > > From: Oscar Arthur Koepke <oscarkoepke@ yahoo.com>

> > > Subject: Re: [ts2068] re: NTSC Spectrum

> > > To: ts2068@yahoogroups. com, "Claudio Bernet" <cbernetp@yahoo.  

> com>

> > > Date: Monday, April 6, 2009, 6:25 PM

> > >

> > > Hi There, Claudio.

> > >

> > > I'm from Brazil and I have 2(units) of Sinclair ZX Spectrum48k but

> > > can't put it to work because they are bolth from UK in PAG_I(PAL- 

> G)

> > > channel 36 UHF I Have found a way to get videocomposite out but

> > > still in PAL-G.

> > > Here in Brazil we have TV sets with tri video sistems NTSC(from

> > > USA), PAL-M(BRAZIL) and PAL-N(from Uruguay and Argentina).

> > > So you NTSC modification will work fine around here...

> > >

> > > Can you give a closer photo shot(CloseUP) from the inside of the  

> RF

> > > shilded box from your Speccy48k?

> > > Have you some schematics(from the Circuits) from these

> > > modifications( both TV NTSC output and KempstoneJoystick) to share

> > > with all users from the Group here in Yahoo! ??

> > >

> > > Thanks,

> > >

> > > OSCAR KOEPKE

> > > BRAZIL

> > >

> > > --- On Sun, 4/5/09, Claudio Bernet <cbernetp@yahoo. com> wrote:

> > >

> > > From: Claudio Bernet <cbernetp@yahoo. com>

> > > Subject: Re: [ts2068] re: NTSC Spectrum

> > > To: ts2068@yahoogroups. com

> > > Date: Sunday, April 5, 2009, 10:12 PM

> > >

> > > Hi all,

> > >

> > > In order to help zxbruno, this are photos of my NTSC speccy (48k).

> > >

> > > I'am from Chile (excuse my lack of english)... I have two ntsc

> > > speccys: my old one modded with a kempston port (photos) and  

> another

> > > mint one for my collection.

> > >

> > > In Chile, mid-80's, the zx-spectrum was not a very succesful  

> machine

> > > in the markets, but a few ones love it. Atari 8 bit line was the

> > > winner in those days. I think in my country were imported about  

> 5000

> > > 48k ntsc speccys... later, Sinclair Chile imported the Timex

> > > Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS

> > > 2068, but thats a different machine as all we know.

> > >

> > > Well, hope this help this great group to find some answers.

> > >

> > > Don't bother to ask me some questions.

> > >

> > > Good waves from Chile.

> > >

> > > Claudio

> > >

> > >

> > >

> > >

> > >

> > > --- On Sun, 4/5/09, zxbruno <zxspectrum128@ gmail.com> wrote:

> > > From: zxbruno <zxspectrum128@ gmail.com>

> > > Subject: [ts2068] re: NTSC Spectrum

> > > To: ts2068@yahoogroups. com

> > > Date: Sunday, April 5, 2009, 4:46 PM

> > >

> > > Al Hartman wrote: "I don't know where it came from exactly, but I

> > > have an NTSC Spectrum.

> > >

> > > It's labeled Sinclair, and NOT Timex/Sinclair.

> > >

> > > I don't know where Stuart got it from, except possibly from Timex

> > > Portugal or from his contact who bought a warehouse full of Timex

> > > stock which were returns from Deptartment stores and the like."

> > >

> > > Hi Al.

> > >

> > > Although some of us already have European Spectrums connected to

> > > Multi-System TVs or PC video capture cards, the mistery remains.  

> We

> > > know it needed more than one NTSC TV modulator to work over  

> here. I

> > > would like to know if the ULA is different and what's written on  

> top

> > > of it (because the video signal originates there first), how did

> > > they solve the timing issues, etc.

> > >

> > > I dedicated many hours to search engines trying to find  

> information

> > > about NTSC ZX Spectrums in the U.S. and Chile. It seems you're our

> > > only hope for answers...

> > >

> > > Could you please, at some point, provide a picture of the board of

> > > that Spectrum for us to study? It won't give us all the answers,  

> but

> > > it will provide clues and satisfy our curiosity.

> > >

> > >

> > >

> > >

> > >

> > >

> > >

> >

>

>

>

>

>

>

28. Re: [ts2068] Re: NTSC Spectrum

Fred · Fri, 10 Apr 2009 22:57 · 📎 2: file, file

Hi Oscar (& Victor),
I believe you that you get that picture on that TV, but that doesn't  
prove that you have NTSC output, just that you have a signal  
compatible with that TV (a quick Google shows that it handles PAL-M  
and NTSC, it could easily also support PAL-B/G etc. which may allow it  
to handle a 50Hz 312 line NTSC colour signal input). Do you have any  
other information detailing the TV output of that machine (scope  
traces etc.?).

Can you run the attached program against that Spectrum to extract the  
frame length? This will allow us to establish the number of frames/sec  
to help substantiate your claims.

Chris Smith has implemented a drop-in replacement for the Spectrum  
ULA, and is in the process of documenting the operation of the whole  
chip based on X-Ray images and photos of the die (see http://www.zxdesign.info/book/ 
  for more info), so I believe he has a thorough understanding of the  
issues involved in video signal generation in the Spectrum. He  
comments on WoS (http://www.worldofspectrum.org/forums/showpost.php?p=345730&postcount=20 
):
> That can't work, or the display will be rubbish. As fred points out,  
> the master crystal controls all the timing, and ramping up the clock  
> may give you 60Hz at 312 lines, but not 60Hz at 263-265 lines.


Without a modified ULA I don't believe that machine is outputting 60Hz  
26x lines, but I am happy to see the proof which would make quite a  
few people in the US happy to be able to use UK Spectrums in the US!

Fred




On 10/04/2009, at 21:22, [email] wrote:

>
>
> Hi there Fred.
>
> I am sure that the ULA is the SAME!! keep reading...
>
> I have a friend here(Victor Trucco) in Brazil that have a ZX  
> Spectrum48kb from England(UK) and he removed the content of the  
> shilded box(see in http:// m244. photobucket. com/ albumview/albums/  
> vtrucco/testes/ DSC02257.jpg.html? ) and changed the XTAL cristal  
> from 4.43..(PAL-G) to 3.575611(pal-M same nr.of lines of NTSC-M from  
> USA and also 60Hz) and added a eletrolitic capacitor 100uF x 16V(the  
> positive leg in the signal that goes to the box(shilded, not the  
> ground) and the negative in the RCA female conetcor tha gives  
> videocomposite signal out) and it works great! {see image in  
> Mitsubishi TV set from Brazil in http://m244. photobucket.com/  
> albumview/albums/ vtrucco/testes/ DSC02256.jpg.html? )
>
> He told me to get the NTSC signal I only need to change the Xtal  
> crital to 3.579545, he has a lot of expertise in hardware from  
> Sinclair, MSX, Amiga, TandyColor(coco), videogames(lot from  
> Atari2600,  
> odyssey2,colecovision,SegaMegadrive,SegaGenesis,NES,SNES,etc.).
>
> He recently buil a cartige emulator[with PIC processor] to use in  
> all kind of 8bit computers(sinclair Spectrum48,MSX,atari800,C64) and  
> videogames(odyssey2,Atari2600,Atari5200,SegaMasterSystem,gameboy)  
> and has tutorials in the internet of how to build cartiges to use on  
> it.
> Its a great hardware and he made one for me, still need to make the  
> cartridges from the instructions to make mine work.
>
> You can see the instruction to build(portuguese of course,easy to  
> translate): cartridge for master system (sega) in http://www.  
> instructables.com/id/Emulador_de_Cartucho_Master_System/
> or cartridge for Magnavox Odyssey2 in http://www. instructables.com/ 
> id/Emulador_de_Cartucho_Odyssey/ or cartridge for MSX in http://www.  
> instructables.com/id/Emulador_de_Cartucho_MSX/ or cartridge for TRS  
> Color (coco) in http://www. instructables.com/id/ 
> Emulador_de_Cartucho_CP400/ or cable(old floppy) for the emulator in http://www 
> . instructables.com/id/Cabo_para_o_Emulador_de_Cartucho/ or The  
> Emulator itself in http://www. instructables.com/id/ 
> Emulador_de_Cartucho_Montagem/ or cartridge for Atari2600 in http://  
> www. instructables.com/id/Emulador_de_Cartucho_Atari_2600/ or  
> cartridge for Sinclair Spectrum in http://www. instructables.com/id/ 
> Emulador_de_Cartucho_TK90X/
>
> Enjoy all...
>
> Has video in youtube also showing how it works in:
> http://www. youtube.com/watch?v=sHuRIzfnXhQ&feature=channel_page
> or more pictures in
> http://s244. photobucket.com/albums/ gg28/vtrucco/ Emulador%20de 
> %20Cartucho/
>
> He knows what he is talking about....
>
> Oscar
>
>
> crital frequency (chage coma to point)
> 3,579545 (NTSC USA 60Hz), 3,575611 (Pal-M BRAZIL 60Hz) e 3,582056  
> (Pal-N Argentina and Uruguay 50Hz)
>
> --- On Thu, 4/9/09, Fred <[email]> wrote:
>
> From: Fred <[email]>
> Subject: Re: [ts2068] Re: NTSC Spectrum
> To: [email]
> Date: Thursday, April 9, 2009, 11:44 PM
>
> Hi Oscar,
> I don't see how this can be true. The ULA generates the interrupts of
> which there are 50/sec in PAL land and 60/sec in NTSC land. It also
> has to generate the correct number of lines in the output image; 263
> or so in NTSC land vs 312 in PAL land.
>
> Note this is also how the Timex clones work - the NTSC TS2068 has a
> different SCLD to the PAL TS2068/TC2048. The Timex technical spec
> describes exactly how the counters in the SCLD directly drive the
> generation of lines and times for the video output.
>
> Unlike the ZX81 there doesn't appear to be any external configuration
> that would allow these differences to be configured in jumpers or the
> like. It appears to me that also now know that the ULA used in these
> machines are not the same ones used in the PAL versions.
>
> I expect that producing an NTSC Spectrum involves: correct ULA,
> correct master clock (14.11MHz for NTSC, 14MHz for PAL), correct
> colour burst clock and correct video signal encoder for PAL or NTSC.
>
> Thanks,
> Fred
>
> On 10/04/2009, at 6:43, Oscar Arthur Koepke wrote:
> > The ULA from both systems is the same...
> >
> > It don't get tv signal it is outside the ULA like LM18xx.
> > The secret is the XTAL cristal frequency and some minor adjustments
> > to get a channel in VHF not UHF.
> >
> > ULA give you VIEDOCOMPONENT SIGNALS not even RGB or RF signals its
> > all outside the chip near the RF Shielded box or even inside...(in
> > normal ZX Spectrum48Kb PAL-G the signal that gos to the BOX is
> > VIDEOCOMPOSITE signal in PAL-G).
> >
> >
> >
> > --- On Thu, 4/9/09, zxbruno <zxspectrum128@ gmail.com> wrote:
> >
> > From: zxbruno <zxspectrum128@ gmail.com>
> > Subject: [ts2068] Re: NTSC Spectrum
> > To: ts2068@yahoogroups. com
> > Date: Thursday, April 9, 2009, 12:01 PM
> >
> > I'm so glad to have "found" Claudio! Thank you so much for wanting
> > to help.
> >
> > I quote a message sent to me by Chris Smith (which is working on the
> > ULA book and the Harlequin clone):
> >
> > "Chris Smith to me
> > 7:14 AM (36 minutes ago)
> >
> > Can you get any of your known NTSC owning people to run a suite of
> > test
> > programs? (see wos thread for details).
> >
> > http://www.worldofs pectrum.org/ forums/showthrea d.php?t=24446
> >
> > Particularly phil's fusetest.
> > Any other tests would be useful, should we compile a list???
> >
> > Photos of the result screens would be excellent.
> >
> > It would be revealing to compare the Chile machine against the US
> > owned
> > prototype, to see if they are different.
> >
> > A much better idea, and something that does not require opening
> > anything!"
> >
> > --- In ts2068@yahoogroups. com, Claudio Bernet <cbernetp@.. .>  
> wrote:
> > >
> > > Fred,
> > >
> > > I dont know a bit about electronics and nothing about z80
> > programming. But, if you send me some program to run, surely I can
> > help. I have time this weekend.
> > >
> > > If you need some more shots or what ever that may help, just ask.
> > >
> > > Regards
> > > Claudio
> > >
> > >
> > >
> > >
> > >
> > >
> > > --- On Thu, 4/9/09, Fred <fredm@...> wrote:
> > >
> > > From: Fred <fredm@...>
> > > Subject: Re: [ts2068] re: NTSC Spectrum
> > > To: ts2068@yahoogroups. com
> > > Date: Thursday, April 9, 2009, 4:18 PM
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Hi Claudio,
> > > Are you in a position to run some test code on the Spectrum so
> > that we
> > > can extract the timing details for this NTSC ULA?
> > >
> > > Thanks,
> > > Fred
> > >
> > > On 07/04/2009, at 2:21, Claudio Bernet wrote:
> > >
> > > > Oscar,
> > > >
> > > > Hello. Look, I don't know a bit about electronics, but note that
> > the
> > > > TV output is not modded, this model was constructed with NTSC
> > > > output. The kempton port is a mod, maded 15 years ago, don't  
> have
> > > > schematics of that, but I think it's a simple mod, sure you can
> > find
> > > > some googling.
> > > >
> > > > I will take some shots of the RF interior this night, if someone
> > > > here need a special take please just post here.
> > > >
> > > > Regards
> > > > Claudio
> > > >
> > > >
> > > >
> > > > --- On Mon, 4/6/09, Oscar Arthur Koepke <oscarkoepke@ yahoo.com>
> > wrote:
> > > > From: Oscar Arthur Koepke <oscarkoepke@ yahoo.com>
> > > > Subject: Re: [ts2068] re: NTSC Spectrum
> > > > To: ts2068@yahoogroups. com, "Claudio Bernet" <cbernetp@yahoo.
> > com>
> > > > Date: Monday, April 6, 2009, 6:25 PM
> > > >
> > > > Hi There, Claudio.
> > > >
> > > > I'm from Brazil and I have 2(units) of Sinclair ZX Spectrum48k  
> but
> > > > can't put it to work because they are bolth from UK in  
> PAG_I(PAL-
> > G)
> > > > channel 36 UHF I Have found a way to get videocomposite out but
> > > > still in PAL-G.
> > > > Here in Brazil we have TV sets with tri video sistems NTSC(from
> > > > USA), PAL-M(BRAZIL) and PAL-N(from Uruguay and Argentina).
> > > > So you NTSC modification will work fine around here...
> > > >
> > > > Can you give a closer photo shot(CloseUP) from the inside of the
> > RF
> > > > shilded box from your Speccy48k?
> > > > Have you some schematics(from the Circuits) from these
> > > > modifications( both TV NTSC output and KempstoneJoystick) to  
> share
> > > > with all users from the Group here in Yahoo! ??
> > > >
> > > > Thanks,
> > > >
> > > > OSCAR KOEPKE
> > > > BRAZIL
> > > >
> > > > --- On Sun, 4/5/09, Claudio Bernet <cbernetp@yahoo. com> wrote:
> > > >
> > > > From: Claudio Bernet <cbernetp@yahoo. com>
> > > > Subject: Re: [ts2068] re: NTSC Spectrum
> > > > To: ts2068@yahoogroups. com
> > > > Date: Sunday, April 5, 2009, 10:12 PM
> > > >
> > > > Hi all,
> > > >
> > > > In order to help zxbruno, this are photos of my NTSC speccy  
> (48k).
> > > >
> > > > I'am from Chile (excuse my lack of english)... I have two ntsc
> > > > speccys: my old one modded with a kempston port (photos) and
> > another
> > > > mint one for my collection.
> > > >
> > > > In Chile, mid-80's, the zx-spectrum was not a very succesful
> > machine
> > > > in the markets, but a few ones love it. Atari 8 bit line was the
> > > > winner in those days. I think in my country were imported about
> > 5000
> > > > 48k ntsc speccys... later, Sinclair Chile imported the Timex
> > > > Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS
> > > > 2068, but thats a different machine as all we know.
> > > >
> > > > Well, hope this help this great group to find some answers.
> > > >
> > > > Don't bother to ask me some questions.
> > > >
> > > > Good waves from Chile.
> > > >
> > > > Claudio
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > --- On Sun, 4/5/09, zxbruno <zxspectrum128@ gmail.com> wrote:
> > > > From: zxbruno <zxspectrum128@ gmail.com>
> > > > Subject: [ts2068] re: NTSC Spectrum
> > > > To: ts2068@yahoogroups. com
> > > > Date: Sunday, April 5, 2009, 4:46 PM
> > > >
> > > > Al Hartman wrote: "I don't know where it came from exactly,  
> but I
> > > > have an NTSC Spectrum.
> > > >
> > > > It's labeled Sinclair, and NOT Timex/Sinclair.
> > > >
> > > > I don't know where Stuart got it from, except possibly from  
> Timex
> > > > Portugal or from his contact who bought a warehouse full of  
> Timex
> > > > stock which were returns from Deptartment stores and the like."
> > > >
> > > > Hi Al.
> > > >
> > > > Although some of us already have European Spectrums connected to
> > > > Multi-System TVs or PC video capture cards, the mistery remains.
> > We
> > > > know it needed more than one NTSC TV modulator to work over
> > here. I
> > > > would like to know if the ULA is different and what's written on
> > top
> > > > of it (because the video signal originates there first), how did
> > > > they solve the timing issues, etc.
> > > >
> > > > I dedicated many hours to search engines trying to find
> > information
> > > > about NTSC ZX Spectrums in the U.S. and Chile. It seems you're  
> our
> > > > only hope for answers...
> > > >
> > > > Could you please, at some point, provide a picture of the  
> board of
> > > > that Spectrum for us to study? It won't give us all the answers,
> > but
> > > > it will provide clues and satisfy our curiosity.
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>

29. Re: [ts2068] Re: NTSC Spectrum

Don Dindang · Fri, 10 Apr 2009 08:34

I agree with Oscar

I try connect my spectrum (48K, +2/+2A and +3) with composite out to NTSC TV,
All work fine except that it show in black and white, no color. 
Does it mean ULA does not do any thing about PAL or NTSC?

Also TC2048 or TC2068, they use LM1377 for video/color circuit, there is a pin for select PAL/NTSC, does it mean their ULA does not do any thing about PAL or NTSC?


--- On Fri, 4/10/09, [email] <[email]> wrote:

From: [email] <[email]>
Subject: Re: [ts2068] Re: NTSC Spectrum
To: [email], "Fred" <[email]>, "oscar yahoo" <[email]>
Cc: "Victor Trucco" <[email]>
Date: Friday, April 10, 2009, 4:22 AM

















      Hi there Fred.

I am sure that the ULA is the SAME!! keep reading...

I have a friend here(Victor Trucco) in Brazil that have a ZX Spectrum48kb from England(UK) and he removed the content of the shilded box(see in http:// m244. photobucket. com/ albumview/albums/ vtrucco/testes/ DSC02257.jpg. html? ) and changed the XTAL cristal from 4.43..(PAL-G) to 3.575611(pal- M same nr.of lines of NTSC-M from USA and also 60Hz) and added a eletrolitic capacitor 100uF x 16V(the positive leg in the signal that goes to the box(shilded, not the ground) and the negative in the RCA female conetcor tha gives videocomposite signal out) and it works great! {see image in Mitsubishi TV set from Brazil in http://m244. photobucket. com/ albumview/albums/ vtrucco/testes/ DSC02256.jpg. html?
 )

He told me to get the NTSC signal I only need to change the Xtal crital to
 3.579545, he has a lot of
 expertise in hardware from Sinclair, MSX, Amiga, TandyColor(coco) , videogames(lot from Atari2600, odyssey2,colecovisi on,SegaMegadrive ,SegaGenesis, NES,SNES, etc.).

He recently buil a cartige emulator[with PIC processor] to use in all kind of 8bit computers(sinclair Spectrum48,MSX, atari800, C64) and videogames(odyssey2 ,Atari2600, Atari5200, SegaMasterSystem ,gameboy) and has tutorials in the internet of how to build cartiges to use on it. 
Its a great hardware and he made one for me, still need to make the cartridges from the instructions to make mine work.

You can see the instruction to build(portuguese of course,easy to translate): cartridge for master system (sega) in http://www. instructables. com/id/Emulador_ de_Cartucho_ Master_System/
or cartridge for Magnavox Odyssey2 in http://www. instructables. com/id/Emulador_ de_Cartucho_ Odyssey/ or cartridge for MSX in http://www. instructables. com/id/Emulador_ de_Cartucho_ MSX/ or cartridge for TRS
 Color (coco) in http://www. instructables. com/id/Emulador_ de_Cartucho_ CP400/ or cable(old floppy) for the emulator in
 http://www. instructables. com/id/Cabo_ para_o_Emulador_ de_Cartucho/ or The Emulator itself in http://www. instructables. com/id/Emulador_ de_Cartucho_ Montagem/ or cartridge for Atari2600 in http:// www. instructables. com/id/Emulador_ de_Cartucho_ Atari_2600/ or cartridge for Sinclair Spectrum in http://www. instructables. com/id/Emulador_ de_Cartucho_ TK90X/

Enjoy all...

Has video in youtube also showing how it works in:
http://www. youtube.com/ watch?v=sHuRIzfn XhQ&feature=channel_ page
or more pictures in
http://s244. photobucket. com/albums/ gg28/vtrucco/ Emulador%20de% 20Cartucho/

He knows what he is talking about....

Oscar


crital frequency
 (chage coma to point)
3,579545 (NTSC USA 60Hz), 3,575611 (Pal-M BRAZIL 60Hz) e 3,582056 (Pal-N Argentina and Uruguay 50Hz) 

--- On Thu, 4/9/09, Fred <fredm@spamcop. net> wrote:

From: Fred <fredm@spamcop. net>
Subject: Re: [ts2068] Re: NTSC Spectrum
To: ts2068@yahoogroups. com
Date: Thursday, April 9, 2009, 11:44 PM










      Hi Oscar,

I don't see how this can be true. The ULA generates the interrupts of  

which there are 50/sec in PAL land and 60/sec in NTSC land. It also  

has to generate the correct number of lines in the output image; 263  

or so in NTSC land vs 312 in PAL land.



Note this is also how the Timex clones work - the NTSC TS2068 has a  

different SCLD to the PAL TS2068/TC2048. The Timex technical spec  

describes exactly how the counters in the SCLD directly drive the  

generation of lines and times for the video output.



Unlike the ZX81 there doesn't appear to be any external configuration  

that would allow these differences to be configured in jumpers or the  

like. It appears to me that also now know that the ULA used in these  

machines are not the same ones used in the PAL versions.



I expect that producing an NTSC Spectrum involves: correct ULA,  

correct master clock (14.11MHz for NTSC, 14MHz for PAL), correct  

colour burst clock and correct video signal encoder for PAL or NTSC.



Thanks,

Fred



On 10/04/2009, at 6:43, Oscar Arthur Koepke wrote:

> The ULA from both systems is the same...

>

> It don't get tv signal it is outside the ULA like LM18xx.

> The secret is the XTAL cristal frequency and some minor adjustments  

> to get a channel in VHF not UHF.

>

> ULA give you VIEDOCOMPONENT SIGNALS not even RGB or RF signals its  

> all outside the chip near the RF Shielded box or even inside...(in  

> normal ZX Spectrum48Kb PAL-G the signal that gos to the BOX is  

> VIDEOCOMPOSITE signal in PAL-G).

>

>

>

> --- On Thu, 4/9/09, zxbruno <zxspectrum128@ gmail.com> wrote:

>

> From: zxbruno <zxspectrum128@ gmail.com>

> Subject: [ts2068] Re: NTSC Spectrum

> To: ts2068@yahoogroups. com

> Date: Thursday, April 9, 2009, 12:01 PM

>

> I'm so glad to have "found" Claudio! Thank you so much for wanting  

> to help.

>

> I quote a message sent to me by Chris Smith (which is working on the  

> ULA book and the Harlequin clone):

>

> "Chris Smith to me

> 7:14 AM (36 minutes ago)

>

> Can you get any of your known NTSC owning people to run a suite of  

> test

> programs? (see wos thread for details).

>

> http://www.worldofs pectrum.org/ forums/showthrea d.php?t=24446

>

> Particularly phil's fusetest.

> Any other tests would be useful, should we compile a list???

>

> Photos of the result screens would be excellent.

>

> It would be revealing to compare the Chile machine against the US  

> owned

> prototype, to see if they are different.

>

> A much better idea, and something that does not require opening  

> anything!"

>

> --- In ts2068@yahoogroups. com, Claudio Bernet <cbernetp@.. .> wrote:

> >

> > Fred,

> >

> > I dont know a bit about electronics and nothing about z80  

> programming. But, if you send me some program to run, surely I can  

> help. I have time this weekend.

> >

> > If you need some more shots or what ever that may help, just ask.

> >

> > Regards

> > Claudio

> >

> >

> >

> >

> >

> >

> > --- On Thu, 4/9/09, Fred <fredm@...> wrote:

> >

> > From: Fred <fredm@...>

> > Subject: Re: [ts2068] re: NTSC Spectrum

> > To: ts2068@yahoogroups. com

> > Date: Thursday, April 9, 2009, 4:18 PM

> >

> >

> >

> >

> >

> >

> >

> >

> > Hi Claudio,

> > Are you in a position to run some test code on the Spectrum so  

> that we

> > can extract the timing details for this NTSC ULA?

> >

> > Thanks,

> > Fred

> >

> > On 07/04/2009, at 2:21, Claudio Bernet wrote:

> >

> > > Oscar,

> > >

> > > Hello. Look, I don't know a bit about electronics, but note that  

> the

> > > TV output is not modded, this model was constructed with NTSC

> > > output. The kempton port is a mod, maded 15 years ago, don't have

> > > schematics of that, but I think it's a simple mod, sure you can  

> find

> > > some googling.

> > >

> > > I will take some shots of the RF interior this night, if someone

> > > here need a special take please just post here.

> > >

> > > Regards

> > > Claudio

> > >

> > >

> > >

> > > --- On Mon, 4/6/09, Oscar Arthur Koepke <oscarkoepke@ yahoo.com>  

> wrote:

> > > From: Oscar Arthur Koepke <oscarkoepke@ yahoo.com>

> > > Subject: Re: [ts2068] re: NTSC Spectrum

> > > To: ts2068@yahoogroups. com, "Claudio Bernet" <cbernetp@yahoo.  

> com>

> > > Date: Monday, April 6, 2009, 6:25 PM

> > >

> > > Hi There, Claudio.

> > >

> > > I'm from Brazil and I have 2(units) of Sinclair ZX Spectrum48k but

> > > can't put it to work because they are bolth from UK in PAG_I(PAL- 

> G)

> > > channel 36 UHF I Have found a way to get videocomposite out but

> > > still in PAL-G.

> > > Here in Brazil we have TV sets with tri video sistems NTSC(from

> > > USA), PAL-M(BRAZIL) and PAL-N(from Uruguay and Argentina).

> > > So you NTSC modification will work fine around here...

> > >

> > > Can you give a closer photo shot(CloseUP) from the inside of the  

> RF

> > > shilded box from your Speccy48k?

> > > Have you some schematics(from the Circuits) from these

> > > modifications( both TV NTSC output and KempstoneJoystick) to share

> > > with all users from the Group here in Yahoo! ??

> > >

> > > Thanks,

> > >

> > > OSCAR KOEPKE

> > > BRAZIL

> > >

> > > --- On Sun, 4/5/09, Claudio Bernet <cbernetp@yahoo. com> wrote:

> > >

> > > From: Claudio Bernet <cbernetp@yahoo. com>

> > > Subject: Re: [ts2068] re: NTSC Spectrum

> > > To: ts2068@yahoogroups. com

> > > Date: Sunday, April 5, 2009, 10:12 PM

> > >

> > > Hi all,

> > >

> > > In order to help zxbruno, this are photos of my NTSC speccy (48k).

> > >

> > > I'am from Chile (excuse my lack of english)... I have two ntsc

> > > speccys: my old one modded with a kempston port (photos) and  

> another

> > > mint one for my collection.

> > >

> > > In Chile, mid-80's, the zx-spectrum was not a very succesful  

> machine

> > > in the markets, but a few ones love it. Atari 8 bit line was the

> > > winner in those days. I think in my country were imported about  

> 5000

> > > 48k ntsc speccys... later, Sinclair Chile imported the Timex

> > > Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS

> > > 2068, but thats a different machine as all we know.

> > >

> > > Well, hope this help this great group to find some answers.

> > >

> > > Don't bother to ask me some questions.

> > >

> > > Good waves from Chile.

> > >

> > > Claudio

> > >

> > >

> > >

> > >

> > >

> > > --- On Sun, 4/5/09, zxbruno <zxspectrum128@ gmail.com> wrote:

> > > From: zxbruno <zxspectrum128@ gmail.com>

> > > Subject: [ts2068] re: NTSC Spectrum

> > > To: ts2068@yahoogroups. com

> > > Date: Sunday, April 5, 2009, 4:46 PM

> > >

> > > Al Hartman wrote: "I don't know where it came from exactly, but I

> > > have an NTSC Spectrum.

> > >

> > > It's labeled Sinclair, and NOT Timex/Sinclair.

> > >

> > > I don't know where Stuart got it from, except possibly from Timex

> > > Portugal or from his contact who bought a warehouse full of Timex

> > > stock which were returns from Deptartment stores and the like."

> > >

> > > Hi Al.

> > >

> > > Although some of us already have European Spectrums connected to

> > > Multi-System TVs or PC video capture cards, the mistery remains.  

> We

> > > know it needed more than one NTSC TV modulator to work over  

> here. I

> > > would like to know if the ULA is different and what's written on  

> top

> > > of it (because the video signal originates there first), how did

> > > they solve the timing issues, etc.

> > >

> > > I dedicated many hours to search engines trying to find  

> information

> > > about NTSC ZX Spectrums in the U.S. and Chile. It seems you're our

> > > only hope for answers...

> > >

> > > Could you please, at some point, provide a picture of the board of

> > > that Spectrum for us to study? It won't give us all the answers,  

> but

> > > it will provide clues and satisfy our curiosity.

> > >

> > >

> > >

> > >

> > >

> > >

> > >

> >

>

>

>

>

>

>

30. Re: NTSC Spectrum

cheveron · Fri, 10 Apr 2009 15:43

--- In [email], oscarkoepke@... wrote:
> I am sure that the ULA is the SAME!! keep reading...

Well it isn't. The serial number on it identifies it as being different than the one in the standard Spectrum. This info is from Chris Smith who is writing a book on the ULA.

I don't dispute that Victor's changes might enable you to modify a standard ULA to work with NTSC, but the item in question here is an original NTSC ULA.

31. Re: [ts2068] Re: NTSC Spectrum

Fred · Sat, 11 Apr 2009 06:12

Hi Don,
The ULA is responsible for generating the composite video which is by  
definition in the format of a specific TV system, e.g. from http://www.1000bit.net/support/manuali/zxspectrum/sm/section1.html#tvgen 
, note that the ULA and it's timing from the 14MHz master clock drive  
the timings for the external system, the NTSC Spectrum (and TS2068)  
use a 14.11MHz master clock in order to drive an NTSC compatible  
screen generation (along with internal changes to produce the correct  
number of lines):

> TV Picture Generation
> The video compilation section of the ULA operates in conjunction  
> with the memory mapped picure display area in the standard 16k RAM,  
> the colour (chrominance) modulator (IC14) and the UHF modulator.  
> This combination produces a high resolution, 24 line x 32 character,  
> eight colour TV display.
>
> Using the 14 MHz clock the ULA derives line and field timing  
> compatible with the external TV receiver. Video is derived by  
> accessing the memory mapped display area in the RAM in a set  
> sequence at set times throughout the picture frame. The addresses  
> are necessarily independent of the CPU and appear on the ULA address  
> lines A6 through A0 as two seperate bytes timed by the RAS/CAS row/ 
> column address select lines.
>
> The net result is three seperate video waveforms outputs from the  
> ULA on pins 15, 16 and 17. These carry the luminence signal Y,  
> incorporating the line and field sync, and two unmodulated colour  
> difference signals U and Y making the Spectrum compatible with both  
> colour and monochrome receivers.
>
> From the ULA the colour difference signals are applied to the colour  
> modulator IC14 via two level shifting networks. These match the ULA  
> output levels with those required by the B-Y and R-Y inputs to the  
> modulator. In the Issue 2 Spectrum the level shifting network is  
> passive, incorporating two potentiometers VR1, VR2. These are  
> required to set-up the chroma bias level on IC14 pin 3 such that the  
> voltage difference measured between pin 3 and the colour difference  
> signals on pins 2 and 3 respectively in nominally 0V dc. In the  
> Issue 3 Spectrum two active networks incorporating TR8 and TR9  
> eliminate the potentiometers, greatly improving colour stability.
>
> The level shifted colour difference signals, input to IC14, are then  
> encoded, by quadrature modulating two 4.43 MHz chroma sub-carriers.  
> The sub-carriers are generated with the assistance of an external  
> crystal X2 and a CR lead/lag network introducing a 90 degrees phase  
> shift between pins 1 and 18. (A further difference between the Issue  
> 2 and 3 Spectrums lies in the bias oscillator. The early issues  
> incorporate a trimmer TC2 allowing the chroma sub-carrier frequency  
> to be adjusted; on the later issues the frequency is fixed). The  
> resultant modulated colour difference signals are finally mixed  
> producing a composite chroma sub-carrier at IC14 pin 13.
>
> At this point the chroma signal is ac coupled to the base of TR2 and  
> added to the inverted luminence signal on TR1 collector. The  
> resultant composite video is then buffered and applied to an  
> encapsulated UHF modulator operating on European standard channel 36.
>


All your observation shows is that your TV can sync to a 312 line 50Hz  
composite signal.

In your case making some modifications to the colour carrier to NTSC- 
style may well give you a colour picture, but that signal would by no  
means be NTSC.

Fred

On 11/04/2009, at 1:34, Don Dindang wrote:

>
>
> I agree with Oscar
>
> I try connect my spectrum (48K, +2/+2A and +3) with composite out to  
> NTSC TV,
> All work fine except that it show in black and white, no color.
> Does it mean ULA does not do any thing about PAL or NTSC?
>
> Also TC2048 or TC2068, they use LM1377 for video/color circuit,  
> there is a pin for select PAL/NTSC, does it mean their ULA does not  
> do any thing about PAL or NTSC?
>
>
> --- On Fri, 4/10/09, [email] <[email]>  
> wrote:
>
> From: [email] <[email]>
> Subject: Re: [ts2068] Re: NTSC Spectrum
> To: [email], "Fred" <[email]>, "oscar  
> yahoo" <[email]>
> Cc: "Victor Trucco" <[email]>
> Date: Friday, April 10, 2009, 4:22 AM
>
> Hi there Fred.
>
> I am sure that the ULA is the SAME!! keep reading...
>
> I have a friend here(Victor Trucco) in Brazil that have a ZX  
> Spectrum48kb from England(UK) and he removed the content of the  
> shilded box(see in http:// m244. photobucket. com/ albumview/albums/  
> vtrucco/testes/ DSC02257.jpg. html? ) and changed the XTAL cristal  
> from 4.43..(PAL-G) to 3.575611(pal- M same nr.of lines of NTSC-M  
> from USA and also 60Hz) and added a eletrolitic capacitor 100uF x  
> 16V(the positive leg in the signal that goes to the box(shilded, not  
> the ground) and the negative in the RCA female conetcor tha gives  
> videocomposite signal out) and it works great! {see image in  
> Mitsubishi TV set from Brazil in http://m244. photobucket. com/  
> albumview/albums/ vtrucco/testes/ DSC02256.jpg. html? )
>
> He told me to get the NTSC signal I only need to change the Xtal  
> crital to 3.579545, he has a lot of expertise in hardware from  
> Sinclair, MSX, Amiga, TandyColor(coco) , videogames(lot from  
> Atari2600, odyssey2,colecovisi on,SegaMegadrive ,SegaGenesis,  
> NES,SNES, etc.).
>
> He recently buil a cartige emulator[with PIC processor] to use in  
> all kind of 8bit computers(sinclair Spectrum48,MSX, atari800, C64)  
> and videogames(odyssey2 ,Atari2600, Atari5200,  
> SegaMasterSystem ,gameboy) and has tutorials in the internet of how  
> to build cartiges to use on it.
> Its a great hardware and he made one for me, still need to make the  
> cartridges from the instructions to make mine work.
>
> You can see the instruction to build(portuguese of course,easy to  
> translate): cartridge for master system (sega) in http://www.  
> instructables. com/id/Emulador_ de_Cartucho_ Master_System/
> or cartridge for Magnavox Odyssey2 in http://www. instructables. com/ 
> id/Emulador_ de_Cartucho_ Odyssey/ or cartridge for MSX in http:// 
> www. instructables. com/id/Emulador_ de_Cartucho_ MSX/ or cartridge  
> for TRS Color (coco) in http://www. instructables. com/id/Emulador_  
> de_Cartucho_ CP400/ or cable(old floppy) for the emulator in http://www 
> . instructables. com/id/Cabo_ para_o_Emulador_ de_Cartucho/ or The  
> Emulator itself in http://www. instructables. com/id/Emulador_  
> de_Cartucho_ Montagem/ or cartridge for Atari2600 in http:// www.  
> instructables. com/id/Emulador_ de_Cartucho_ Atari_2600/ or  
> cartridge for Sinclair Spectrum in http://www. instructables. com/id/ 
> Emulador_ de_Cartucho_ TK90X/
>
> Enjoy all...
>
> Has video in youtube also showing how it works in:
> http://www. youtube.com/ watch?v=sHuRIzfn XhQ&feature=channel_ page
> or more pictures in
> http://s244. photobucket. com/albums/ gg28/vtrucco/ Emulador%20de%  
> 20Cartucho/
>
> He knows what he is talking about....
>
> Oscar
>
>
> crital frequency (chage coma to point)
> 3,579545 (NTSC USA 60Hz), 3,575611 (Pal-M BRAZIL 60Hz) e 3,582056  
> (Pal-N Argentina and Uruguay 50Hz)
>
> --- On Thu, 4/9/09, Fred <fredm@spamcop. net> wrote:
>
> From: Fred <fredm@spamcop. net>
> Subject: Re: [ts2068] Re: NTSC Spectrum
> To: ts2068@yahoogroups. com
> Date: Thursday, April 9, 2009, 11:44 PM
>
> Hi Oscar,
> I don't see how this can be true. The ULA generates the interrupts of
> which there are 50/sec in PAL land and 60/sec in NTSC land. It also
> has to generate the correct number of lines in the output image; 263
> or so in NTSC land vs 312 in PAL land.
>
> Note this is also how the Timex clones work - the NTSC TS2068 has a
> different SCLD to the PAL TS2068/TC2048. The Timex technical spec
> describes exactly how the counters in the SCLD directly drive the
> generation of lines and times for the video output.
>
> Unlike the ZX81 there doesn't appear to be any external configuration
> that would allow these differences to be configured in jumpers or the
> like. It appears to me that also now know that the ULA used in these
> machines are not the same ones used in the PAL versions.
>
> I expect that producing an NTSC Spectrum involves: correct ULA,
> correct master clock (14.11MHz for NTSC, 14MHz for PAL), correct
> colour burst clock and correct video signal encoder for PAL or NTSC.
>
> Thanks,
> Fred
>
> On 10/04/2009, at 6:43, Oscar Arthur Koepke wrote:
> > The ULA from both systems is the same...
> >
> > It don't get tv signal it is outside the ULA like LM18xx.
> > The secret is the XTAL cristal frequency and some minor adjustments
> > to get a channel in VHF not UHF.
> >
> > ULA give you VIEDOCOMPONENT SIGNALS not even RGB or RF signals its
> > all outside the chip near the RF Shielded box or even inside...(in
> > normal ZX Spectrum48Kb PAL-G the signal that gos to the BOX is
> > VIDEOCOMPOSITE signal in PAL-G).
> >
> >
> >
> > --- On Thu, 4/9/09, zxbruno <zxspectrum128@ gmail.com> wrote:
> >
> > From: zxbruno <zxspectrum128@ gmail.com>
> > Subject: [ts2068] Re: NTSC Spectrum
> > To: ts2068@yahoogroups. com
> > Date: Thursday, April 9, 2009, 12:01 PM
> >
> > I'm so glad to have "found" Claudio! Thank you so much for wanting
> > to help.
> >
> > I quote a message sent to me by Chris Smith (which is working on the
> > ULA book and the Harlequin clone):
> >
> > "Chris Smith to me
> > 7:14 AM (36 minutes ago)
> >
> > Can you get any of your known NTSC owning people to run a suite of
> > test
> > programs? (see wos thread for details).
> >
> > http://www.worldofs pectrum.org/ forums/showthrea d.php?t=24446
> >
> > Particularly phil's fusetest.
> > Any other tests would be useful, should we compile a list???
> >
> > Photos of the result screens would be excellent.
> >
> > It would be revealing to compare the Chile machine against the US
> > owned
> > prototype, to see if they are different.
> >
> > A much better idea, and something that does not require opening
> > anything!"
> >
> > --- In ts2068@yahoogroups. com, Claudio Bernet <cbernetp@.. .>  
> wrote:
> > >
> > > Fred,
> > >
> > > I dont know a bit about electronics and nothing about z80
> > programming. But, if you send me some program to run, surely I can
> > help. I have time this weekend.
> > >
> > > If you need some more shots or what ever that may help, just ask.
> > >
> > > Regards
> > > Claudio
> > >
> > >
> > >
> > >
> > >
> > >
> > > --- On Thu, 4/9/09, Fred <fredm@...> wrote:
> > >
> > > From: Fred <fredm@...>
> > > Subject: Re: [ts2068] re: NTSC Spectrum
> > > To: ts2068@yahoogroups. com
> > > Date: Thursday, April 9, 2009, 4:18 PM
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Hi Claudio,
> > > Are you in a position to run some test code on the Spectrum so
> > that we
> > > can extract the timing details for this NTSC ULA?
> > >
> > > Thanks,
> > > Fred
> > >
> > > On 07/04/2009, at 2:21, Claudio Bernet wrote:
> > >
> > > > Oscar,
> > > >
> > > > Hello. Look, I don't know a bit about electronics, but note that
> > the
> > > > TV output is not modded, this model was constructed with NTSC
> > > > output. The kempton port is a mod, maded 15 years ago, don't  
> have
> > > > schematics of that, but I think it's a simple mod, sure you can
> > find
> > > > some googling.
> > > >
> > > > I will take some shots of the RF interior this night, if someone
> > > > here need a special take please just post here.
> > > >
> > > > Regards
> > > > Claudio
> > > >
> > > >
> > > >
> > > > --- On Mon, 4/6/09, Oscar Arthur Koepke <oscarkoepke@ yahoo.com>
> > wrote:
> > > > From: Oscar Arthur Koepke <oscarkoepke@ yahoo.com>
> > > > Subject: Re: [ts2068] re: NTSC Spectrum
> > > > To: ts2068@yahoogroups. com, "Claudio Bernet" <cbernetp@yahoo.
> > com>
> > > > Date: Monday, April 6, 2009, 6:25 PM
> > > >
> > > > Hi There, Claudio.
> > > >
> > > > I'm from Brazil and I have 2(units) of Sinclair ZX Spectrum48k  
> but
> > > > can't put it to work because they are bolth from UK in  
> PAG_I(PAL-
> > G)
> > > > channel 36 UHF I Have found a way to get videocomposite out but
> > > > still in PAL-G.
> > > > Here in Brazil we have TV sets with tri video sistems NTSC(from
> > > > USA), PAL-M(BRAZIL) and PAL-N(from Uruguay and Argentina).
> > > > So you NTSC modification will work fine around here...
> > > >
> > > > Can you give a closer photo shot(CloseUP) from the inside of the
> > RF
> > > > shilded box from your Speccy48k?
> > > > Have you some schematics(from the Circuits) from these
> > > > modifications( both TV NTSC output and KempstoneJoystick) to  
> share
> > > > with all users from the Group here in Yahoo! ??
> > > >
> > > > Thanks,
> > > >
> > > > OSCAR KOEPKE
> > > > BRAZIL
> > > >
> > > > --- On Sun, 4/5/09, Claudio Bernet <cbernetp@yahoo. com> wrote:
> > > >
> > > > From: Claudio Bernet <cbernetp@yahoo. com>
> > > > Subject: Re: [ts2068] re: NTSC Spectrum
> > > > To: ts2068@yahoogroups. com
> > > > Date: Sunday, April 5, 2009, 10:12 PM
> > > >
> > > > Hi all,
> > > >
> > > > In order to help zxbruno, this are photos of my NTSC speccy  
> (48k).
> > > >
> > > > I'am from Chile (excuse my lack of english)... I have two ntsc
> > > > speccys: my old one modded with a kempston port (photos) and
> > another
> > > > mint one for my collection.
> > > >
> > > > In Chile, mid-80's, the zx-spectrum was not a very succesful
> > machine
> > > > in the markets, but a few ones love it. Atari 8 bit line was the
> > > > winner in those days. I think in my country were imported about
> > 5000
> > > > 48k ntsc speccys... later, Sinclair Chile imported the Timex
> > > > Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS
> > > > 2068, but thats a different machine as all we know.
> > > >
> > > > Well, hope this help this great group to find some answers.
> > > >
> > > > Don't bother to ask me some questions.
> > > >
> > > > Good waves from Chile.
> > > >
> > > > Claudio
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > --- On Sun, 4/5/09, zxbruno <zxspectrum128@ gmail.com> wrote:
> > > > From: zxbruno <zxspectrum128@ gmail.com>
> > > > Subject: [ts2068] re: NTSC Spectrum
> > > > To: ts2068@yahoogroups. com
> > > > Date: Sunday, April 5, 2009, 4:46 PM
> > > >
> > > > Al Hartman wrote: "I don't know where it came from exactly,  
> but I
> > > > have an NTSC Spectrum.
> > > >
> > > > It's labeled Sinclair, and NOT Timex/Sinclair.
> > > >
> > > > I don't know where Stuart got it from, except possibly from  
> Timex
> > > > Portugal or from his contact who bought a warehouse full of  
> Timex
> > > > stock which were returns from Deptartment stores and the like."
> > > >
> > > > Hi Al.
> > > >
> > > > Although some of us already have European Spectrums connected to
> > > > Multi-System TVs or PC video capture cards, the mistery remains.
> > We
> > > > know it needed more than one NTSC TV modulator to work over
> > here. I
> > > > would like to know if the ULA is different and what's written on
> > top
> > > > of it (because the video signal originates there first), how did
> > > > they solve the timing issues, etc.
> > > >
> > > > I dedicated many hours to search engines trying to find
> > information
> > > > about NTSC ZX Spectrums in the U.S. and Chile. It seems you're  
> our
> > > > only hope for answers...
> > > >
> > > > Could you please, at some point, provide a picture of the  
> board of
> > > > that Spectrum for us to study? It won't give us all the answers,
> > but
> > > > it will provide clues and satisfy our curiosity.
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>
>
>

32. Re: NTSC Spectrum

zxbruno · Sat, 11 Apr 2009 01:11

Claudio sent me these pictures after running fusetest on his computer:

http://img.photobucket.com/albums/v400/zxspectrum/fusetest_ntsc_loading.jpg

http://img.photobucket.com/albums/v400/zxspectrum/fusetest_ntsc.jpg

33. Re: [ts2068] Re: NTSC Spectrum

Don Dindang · Fri, 10 Apr 2009 22:34

Hi  Fred,

Thank you for explanation.

Don


--- On Fri, 4/10/09, Fred <[email]> wrote:

From: Fred <[email]>
Subject: Re: [ts2068] Re: NTSC Spectrum
To: [email]
Date: Friday, April 10, 2009, 1:12 PM

















      Hi Don,

The ULA is responsible for generating the composite video which is by  

definition in the format of a specific TV system, e.g. from http://www.1000bit. net/support/ manuali/zxspectr um/sm/section1. html#tvgen 

, note that the ULA and it's timing from the 14MHz master clock drive  

the timings for the external system, the NTSC Spectrum (and TS2068)  

use a 14.11MHz master clock in order to drive an NTSC compatible  

screen generation (along with internal changes to produce the correct  

number of lines):



> TV Picture Generation

> The video compilation section of the ULA operates in conjunction  

> with the memory mapped picure display area in the standard 16k RAM,  

> the colour (chrominance) modulator (IC14) and the UHF modulator.  

> This combination produces a high resolution, 24 line x 32 character,  

> eight colour TV display.

>

> Using the 14 MHz clock the ULA derives line and field timing  

> compatible with the external TV receiver. Video is derived by  

> accessing the memory mapped display area in the RAM in a set  

> sequence at set times throughout the picture frame. The addresses  

> are necessarily independent of the CPU and appear on the ULA address  

> lines A6 through A0 as two seperate bytes timed by the RAS/CAS row/ 

> column address select lines.

>

> The net result is three seperate video waveforms outputs from the  

> ULA on pins 15, 16 and 17. These carry the luminence signal Y,  

> incorporating the line and field sync, and two unmodulated colour  

> difference signals U and Y making the Spectrum compatible with both  

> colour and monochrome receivers.

>

> From the ULA the colour difference signals are applied to the colour  

> modulator IC14 via two level shifting networks. These match the ULA  

> output levels with those required by the B-Y and R-Y inputs to the  

> modulator. In the Issue 2 Spectrum the level shifting network is  

> passive, incorporating two potentiometers VR1, VR2. These are  

> required to set-up the chroma bias level on IC14 pin 3 such that the  

> voltage difference measured between pin 3 and the colour difference  

> signals on pins 2 and 3 respectively in nominally 0V dc. In the  

> Issue 3 Spectrum two active networks incorporating TR8 and TR9  

> eliminate the potentiometers, greatly improving colour stability.

>

> The level shifted colour difference signals, input to IC14, are then  

> encoded, by quadrature modulating two 4.43 MHz chroma sub-carriers.  

> The sub-carriers are generated with the assistance of an external  

> crystal X2 and a CR lead/lag network introducing a 90 degrees phase  

> shift between pins 1 and 18. (A further difference between the Issue  

> 2 and 3 Spectrums lies in the bias oscillator. The early issues  

> incorporate a trimmer TC2 allowing the chroma sub-carrier frequency  

> to be adjusted; on the later issues the frequency is fixed). The  

> resultant modulated colour difference signals are finally mixed  

> producing a composite chroma sub-carrier at IC14 pin 13.

>

> At this point the chroma signal is ac coupled to the base of TR2 and  

> added to the inverted luminence signal on TR1 collector. The  

> resultant composite video is then buffered and applied to an  

> encapsulated UHF modulator operating on European standard channel 36.

>



All your observation shows is that your TV can sync to a 312 line 50Hz  

composite signal.



In your case making some modifications to the colour carrier to NTSC- 

style may well give you a colour picture, but that signal would by no  

means be NTSC.



Fred



On 11/04/2009, at 1:34, Don Dindang wrote:



>

>

> I agree with Oscar

>

> I try connect my spectrum (48K, +2/+2A and +3) with composite out to  

> NTSC TV,

> All work fine except that it show in black and white, no color.

> Does it mean ULA does not do any thing about PAL or NTSC?

>

> Also TC2048 or TC2068, they use LM1377 for video/color circuit,  

> there is a pin for select PAL/NTSC, does it mean their ULA does not  

> do any thing about PAL or NTSC?

>

>

> --- On Fri, 4/10/09, oscarkoepke@ yahoo.com <oscarkoepke@ yahoo.com>  

> wrote:

>

> From: oscarkoepke@ yahoo.com <oscarkoepke@ yahoo.com>

> Subject: Re: [ts2068] Re: NTSC Spectrum

> To: ts2068@yahoogroups. com, "Fred" <fredm@spamcop. net>, "oscar  

> yahoo" <oscarkoepke@ yahoo.com>

> Cc: "Victor Trucco" <vtrucco@finalboss. com>

> Date: Friday, April 10, 2009, 4:22 AM

>

> Hi there Fred.

>

> I am sure that the ULA is the SAME!! keep reading...

>

> I have a friend here(Victor Trucco) in Brazil that have a ZX  

> Spectrum48kb from England(UK) and he removed the content of the  

> shilded box(see in http:// m244. photobucket. com/ albumview/albums/  

> vtrucco/testes/ DSC02257.jpg. html? ) and changed the XTAL cristal  

> from 4.43..(PAL-G) to 3.575611(pal- M same nr.of lines of NTSC-M  

> from USA and also 60Hz) and added a eletrolitic capacitor 100uF x  

> 16V(the positive leg in the signal that goes to the box(shilded, not  

> the ground) and the negative in the RCA female conetcor tha gives  

> videocomposite signal out) and it works great! {see image in  

> Mitsubishi TV set from Brazil in http://m244. photobucket. com/  

> albumview/albums/ vtrucco/testes/ DSC02256.jpg. html? )

>

> He told me to get the NTSC signal I only need to change the Xtal  

> crital to 3.579545, he has a lot of expertise in hardware from  

> Sinclair, MSX, Amiga, TandyColor(coco) , videogames(lot from  

> Atari2600, odyssey2,colecovisi on,SegaMegadrive ,SegaGenesis,  

> NES,SNES, etc.).

>

> He recently buil a cartige emulator[with PIC processor] to use in  

> all kind of 8bit computers(sinclair Spectrum48,MSX, atari800, C64)  

> and videogames(odyssey2 ,Atari2600, Atari5200,  

> SegaMasterSystem ,gameboy) and has tutorials in the internet of how  

> to build cartiges to use on it.

> Its a great hardware and he made one for me, still need to make the  

> cartridges from the instructions to make mine work.

>

> You can see the instruction to build(portuguese of course,easy to  

> translate): cartridge for master system (sega) in http://www.  

> instructables. com/id/Emulador_ de_Cartucho_ Master_System/

> or cartridge for Magnavox Odyssey2 in http://www. instructables. com/ 

> id/Emulador_ de_Cartucho_ Odyssey/ or cartridge for MSX in http:// 

> www. instructables. com/id/Emulador_ de_Cartucho_ MSX/ or cartridge  

> for TRS Color (coco) in http://www. instructables. com/id/Emulador_  

> de_Cartucho_ CP400/ or cable(old floppy) for the emulator in http://www 

> . instructables. com/id/Cabo_ para_o_Emulador_ de_Cartucho/ or The  

> Emulator itself in http://www. instructables. com/id/Emulador_  

> de_Cartucho_ Montagem/ or cartridge for Atari2600 in http:// www.  

> instructables. com/id/Emulador_ de_Cartucho_ Atari_2600/ or  

> cartridge for Sinclair Spectrum in http://www. instructables. com/id/ 

> Emulador_ de_Cartucho_ TK90X/

>

> Enjoy all...

>

> Has video in youtube also showing how it works in:

> http://www. youtube.com/ watch?v=sHuRIzfn XhQ&feature= channel_ page

> or more pictures in

> http://s244. photobucket. com/albums/ gg28/vtrucco/ Emulador%20de%  

> 20Cartucho/

>

> He knows what he is talking about....

>

> Oscar

>

>

> crital frequency (chage coma to point)

> 3,579545 (NTSC USA 60Hz), 3,575611 (Pal-M BRAZIL 60Hz) e 3,582056  

> (Pal-N Argentina and Uruguay 50Hz)

>

> --- On Thu, 4/9/09, Fred <fredm@spamcop. net> wrote:

>

> From: Fred <fredm@spamcop. net>

> Subject: Re: [ts2068] Re: NTSC Spectrum

> To: ts2068@yahoogroups. com

> Date: Thursday, April 9, 2009, 11:44 PM

>

> Hi Oscar,

> I don't see how this can be true. The ULA generates the interrupts of

> which there are 50/sec in PAL land and 60/sec in NTSC land. It also

> has to generate the correct number of lines in the output image; 263

> or so in NTSC land vs 312 in PAL land.

>

> Note this is also how the Timex clones work - the NTSC TS2068 has a

> different SCLD to the PAL TS2068/TC2048. The Timex technical spec

> describes exactly how the counters in the SCLD directly drive the

> generation of lines and times for the video output.

>

> Unlike the ZX81 there doesn't appear to be any external configuration

> that would allow these differences to be configured in jumpers or the

> like. It appears to me that also now know that the ULA used in these

> machines are not the same ones used in the PAL versions.

>

> I expect that producing an NTSC Spectrum involves: correct ULA,

> correct master clock (14.11MHz for NTSC, 14MHz for PAL), correct

> colour burst clock and correct video signal encoder for PAL or NTSC.

>

> Thanks,

> Fred

>

> On 10/04/2009, at 6:43, Oscar Arthur Koepke wrote:

> > The ULA from both systems is the same...

> >

> > It don't get tv signal it is outside the ULA like LM18xx.

> > The secret is the XTAL cristal frequency and some minor adjustments

> > to get a channel in VHF not UHF.

> >

> > ULA give you VIEDOCOMPONENT SIGNALS not even RGB or RF signals its

> > all outside the chip near the RF Shielded box or even inside...(in

> > normal ZX Spectrum48Kb PAL-G the signal that gos to the BOX is

> > VIDEOCOMPOSITE signal in PAL-G).

> >

> >

> >

> > --- On Thu, 4/9/09, zxbruno <zxspectrum128@ gmail.com> wrote:

> >

> > From: zxbruno <zxspectrum128@ gmail.com>

> > Subject: [ts2068] Re: NTSC Spectrum

> > To: ts2068@yahoogroups. com

> > Date: Thursday, April 9, 2009, 12:01 PM

> >

> > I'm so glad to have "found" Claudio! Thank you so much for wanting

> > to help.

> >

> > I quote a message sent to me by Chris Smith (which is working on the

> > ULA book and the Harlequin clone):

> >

> > "Chris Smith to me

> > 7:14 AM (36 minutes ago)

> >

> > Can you get any of your known NTSC owning people to run a suite of

> > test

> > programs? (see wos thread for details).

> >

> > http://www.worldofs pectrum.org/ forums/showthrea d.php?t=24446

> >

> > Particularly phil's fusetest.

> > Any other tests would be useful, should we compile a list???

> >

> > Photos of the result screens would be excellent.

> >

> > It would be revealing to compare the Chile machine against the US

> > owned

> > prototype, to see if they are different.

> >

> > A much better idea, and something that does not require opening

> > anything!"

> >

> > --- In ts2068@yahoogroups. com, Claudio Bernet <cbernetp@.. .>  

> wrote:

> > >

> > > Fred,

> > >

> > > I dont know a bit about electronics and nothing about z80

> > programming. But, if you send me some program to run, surely I can

> > help. I have time this weekend.

> > >

> > > If you need some more shots or what ever that may help, just ask.

> > >

> > > Regards

> > > Claudio

> > >

> > >

> > >

> > >

> > >

> > >

> > > --- On Thu, 4/9/09, Fred <fredm@...> wrote:

> > >

> > > From: Fred <fredm@...>

> > > Subject: Re: [ts2068] re: NTSC Spectrum

> > > To: ts2068@yahoogroups. com

> > > Date: Thursday, April 9, 2009, 4:18 PM

> > >

> > >

> > >

> > >

> > >

> > >

> > >

> > >

> > > Hi Claudio,

> > > Are you in a position to run some test code on the Spectrum so

> > that we

> > > can extract the timing details for this NTSC ULA?

> > >

> > > Thanks,

> > > Fred

> > >

> > > On 07/04/2009, at 2:21, Claudio Bernet wrote:

> > >

> > > > Oscar,

> > > >

> > > > Hello. Look, I don't know a bit about electronics, but note that

> > the

> > > > TV output is not modded, this model was constructed with NTSC

> > > > output. The kempton port is a mod, maded 15 years ago, don't  

> have

> > > > schematics of that, but I think it's a simple mod, sure you can

> > find

> > > > some googling.

> > > >

> > > > I will take some shots of the RF interior this night, if someone

> > > > here need a special take please just post here.

> > > >

> > > > Regards

> > > > Claudio

> > > >

> > > >

> > > >

> > > > --- On Mon, 4/6/09, Oscar Arthur Koepke <oscarkoepke@ yahoo.com>

> > wrote:

> > > > From: Oscar Arthur Koepke <oscarkoepke@ yahoo.com>

> > > > Subject: Re: [ts2068] re: NTSC Spectrum

> > > > To: ts2068@yahoogroups. com, "Claudio Bernet" <cbernetp@yahoo.

> > com>

> > > > Date: Monday, April 6, 2009, 6:25 PM

> > > >

> > > > Hi There, Claudio.

> > > >

> > > > I'm from Brazil and I have 2(units) of Sinclair ZX Spectrum48k  

> but

> > > > can't put it to work because they are bolth from UK in  

> PAG_I(PAL-

> > G)

> > > > channel 36 UHF I Have found a way to get videocomposite out but

> > > > still in PAL-G.

> > > > Here in Brazil we have TV sets with tri video sistems NTSC(from

> > > > USA), PAL-M(BRAZIL) and PAL-N(from Uruguay and Argentina).

> > > > So you NTSC modification will work fine around here...

> > > >

> > > > Can you give a closer photo shot(CloseUP) from the inside of the

> > RF

> > > > shilded box from your Speccy48k?

> > > > Have you some schematics(from the Circuits) from these

> > > > modifications( both TV NTSC output and KempstoneJoystick) to  

> share

> > > > with all users from the Group here in Yahoo! ??

> > > >

> > > > Thanks,

> > > >

> > > > OSCAR KOEPKE

> > > > BRAZIL

> > > >

> > > > --- On Sun, 4/5/09, Claudio Bernet <cbernetp@yahoo. com> wrote:

> > > >

> > > > From: Claudio Bernet <cbernetp@yahoo. com>

> > > > Subject: Re: [ts2068] re: NTSC Spectrum

> > > > To: ts2068@yahoogroups. com

> > > > Date: Sunday, April 5, 2009, 10:12 PM

> > > >

> > > > Hi all,

> > > >

> > > > In order to help zxbruno, this are photos of my NTSC speccy  

> (48k).

> > > >

> > > > I'am from Chile (excuse my lack of english)... I have two ntsc

> > > > speccys: my old one modded with a kempston port (photos) and

> > another

> > > > mint one for my collection.

> > > >

> > > > In Chile, mid-80's, the zx-spectrum was not a very succesful

> > machine

> > > > in the markets, but a few ones love it. Atari 8 bit line was the

> > > > winner in those days. I think in my country were imported about

> > 5000

> > > > 48k ntsc speccys... later, Sinclair Chile imported the Timex

> > > > Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS

> > > > 2068, but thats a different machine as all we know.

> > > >

> > > > Well, hope this help this great group to find some answers.

> > > >

> > > > Don't bother to ask me some questions.

> > > >

> > > > Good waves from Chile.

> > > >

> > > > Claudio

> > > >

> > > >

> > > >

> > > >

> > > >

> > > > --- On Sun, 4/5/09, zxbruno <zxspectrum128@ gmail.com> wrote:

> > > > From: zxbruno <zxspectrum128@ gmail.com>

> > > > Subject: [ts2068] re: NTSC Spectrum

> > > > To: ts2068@yahoogroups. com

> > > > Date: Sunday, April 5, 2009, 4:46 PM

> > > >

> > > > Al Hartman wrote: "I don't know where it came from exactly,  

> but I

> > > > have an NTSC Spectrum.

> > > >

> > > > It's labeled Sinclair, and NOT Timex/Sinclair.

> > > >

> > > > I don't know where Stuart got it from, except possibly from  

> Timex

> > > > Portugal or from his contact who bought a warehouse full of  

> Timex

> > > > stock which were returns from Deptartment stores and the like."

> > > >

> > > > Hi Al.

> > > >

> > > > Although some of us already have European Spectrums connected to

> > > > Multi-System TVs or PC video capture cards, the mistery remains.

> > We

> > > > know it needed more than one NTSC TV modulator to work over

> > here. I

> > > > would like to know if the ULA is different and what's written on

> > top

> > > > of it (because the video signal originates there first), how did

> > > > they solve the timing issues, etc.

> > > >

> > > > I dedicated many hours to search engines trying to find

> > information

> > > > about NTSC ZX Spectrums in the U.S. and Chile. It seems you're  

> our

> > > > only hope for answers...

> > > >

> > > > Could you please, at some point, provide a picture of the  

> board of

> > > > that Spectrum for us to study? It won't give us all the answers,

> > but

> > > > it will provide clues and satisfy our curiosity.

> > > >

> > > >

> > > >

> > > >

> > > >

> > > >

> > > >

> > >

> >

> >

> >

> >

> >

> >

>

>

>

>

>

>

>

>

34. Re: [ts2068] Re: NTSC Spectrum ...and Thanx for the Tech...

Oscar Arthur Koepke · Sat, 11 Apr 2009 10:54

I don't know what is the meanig of all these talk .....
Is it not to have a signal output that we all can use in NTSC with god image and color?
....or to have some eletronic expertise diploma to sow how mutch teory e of us know....

Working is the only intent.... not to have some Ph.D. in the theory...
So if it is or not NTSC really doen't bother me ....or enyone in thes list. 
But if it works in NTSC TV SETs in color that really mather...

A GOOD EXEMPLE: The Apple II plus works in NTSC but never realy was a NTSC signal(Steve Zorniac had to cheat the NTSC signal).... so who Fxxxxxx CARES!!!

And the Y, B-Y and R-Y they are relly a kind of composte signal....aren't they?



--- On Sat, 4/11/09, Don Dindang <[email]> wrote:

From: Don Dindang <[email]>
Subject: Re: [ts2068] Re: NTSC Spectrum
To: [email]
Date: Saturday, April 11, 2009, 2:34 AM

















      Hi  Fred,

Thank you for explanation.

Don


--- On Fri, 4/10/09, Fred <fredm@spamcop. net> wrote:

From: Fred <fredm@spamcop. net>
Subject: Re: [ts2068] Re: NTSC Spectrum
To: ts2068@yahoogroups. com
Date: Friday, April 10, 2009, 1:12 PM










      Hi Don,

The ULA is responsible for generating the composite video which is by  

definition in the format of a specific TV system, e.g. from http://www.1000bit. net/support/ manuali/zxspectr um/sm/section1. html#tvgen 

, note that the ULA and it's timing from the 14MHz master clock drive  

the timings for the external system, the NTSC Spectrum (and TS2068)  

use a 14.11MHz master clock in order to drive an NTSC compatible  

screen generation (along with internal changes to produce the correct  

number of lines):



> TV Picture Generation

> The video compilation section of the ULA operates in conjunction  

> with the memory mapped picure display area in the standard 16k RAM,  

> the colour (chrominance) modulator (IC14) and the UHF modulator.  

> This combination produces a high resolution, 24 line x 32 character,  

> eight colour TV display.

>

> Using the 14 MHz clock the ULA derives line and field timing  

> compatible with the external TV receiver. Video is derived by  

> accessing the memory mapped display area in the RAM in a set  

> sequence at set times throughout the picture frame. The addresses  

> are necessarily independent of the CPU and appear on the ULA address  

> lines A6 through A0 as two seperate bytes timed by the RAS/CAS row/ 

> column address select lines.

>

> The net result is three seperate video waveforms outputs from the  

> ULA on pins 15, 16 and 17. These carry the luminence signal Y,  

> incorporating the line and field sync, and two unmodulated colour  

> difference signals U and Y making the Spectrum compatible with both  

> colour and monochrome receivers.

>

> From the ULA the colour difference signals are applied to the colour  

> modulator IC14 via two level shifting networks. These match the ULA  

> output levels with those required by the B-Y and R-Y inputs to the  

> modulator. In the Issue 2 Spectrum the level shifting network is  

> passive, incorporating two potentiometers VR1, VR2. These are  

> required to set-up the chroma bias level on IC14 pin 3 such that the  

> voltage difference measured between pin 3 and the colour difference  

> signals on pins 2 and 3 respectively in nominally 0V dc. In the  

> Issue 3 Spectrum two active networks incorporating TR8 and TR9  

> eliminate the potentiometers, greatly improving colour stability.

>

> The level shifted colour difference signals, input to IC14, are then  

> encoded, by quadrature modulating two 4.43 MHz chroma sub-carriers.  

> The sub-carriers are generated with the assistance of an external  

> crystal X2 and a CR lead/lag network introducing a 90 degrees phase  

> shift between pins 1 and 18. (A further difference between the Issue  

> 2 and 3 Spectrums lies in the bias oscillator. The early issues  

> incorporate a trimmer TC2 allowing the chroma sub-carrier frequency  

> to be adjusted; on the later issues the frequency is fixed). The  

> resultant modulated colour difference signals are finally mixed  

> producing a composite chroma sub-carrier at IC14 pin 13.

>

> At this point the chroma signal is ac coupled to the base of TR2 and  

> added to the inverted luminence signal on TR1 collector. The  

> resultant composite video is then buffered and applied to an  

> encapsulated UHF modulator operating on European standard channel 36.

>



All your observation shows is that your TV can sync to a 312 line 50Hz  

composite signal.



In your case making some modifications to the colour carrier to NTSC- 

style may well give you a colour picture, but that signal would by no  

means be NTSC.



Fred



On 11/04/2009, at 1:34, Don Dindang wrote:



>

>

> I agree with Oscar

>

> I try connect my spectrum (48K, +2/+2A and +3) with composite out to  

> NTSC TV,

> All work fine except that it show in black and white, no color.

> Does it mean ULA does not do any thing about PAL or NTSC?

>

> Also TC2048 or TC2068, they use LM1377 for video/color circuit,  

> there is a pin for select PAL/NTSC, does it mean their ULA does not  

> do any thing about PAL or NTSC?

>

>

> --- On Fri, 4/10/09, oscarkoepke@ yahoo.com <oscarkoepke@ yahoo.com>  

> wrote:

>

> From: oscarkoepke@ yahoo.com <oscarkoepke@ yahoo.com>

> Subject: Re: [ts2068] Re: NTSC Spectrum

> To: ts2068@yahoogroups. com, "Fred" <fredm@spamcop. net>, "oscar  

> yahoo" <oscarkoepke@ yahoo.com>

> Cc: "Victor Trucco" <vtrucco@finalboss. com>

> Date: Friday, April 10, 2009, 4:22 AM

>

> Hi there Fred.

>

> I am sure that the ULA is the SAME!! keep reading...

>

> I have a friend here(Victor Trucco) in Brazil that have a ZX  

> Spectrum48kb from England(UK) and he removed the content of the  

> shilded box(see in http:// m244. photobucket. com/ albumview/albums/  

> vtrucco/testes/ DSC02257.jpg. html? ) and changed the XTAL cristal  

> from 4.43..(PAL-G) to 3.575611(pal- M same nr.of lines of NTSC-M  

> from USA and also 60Hz) and added a eletrolitic capacitor 100uF x  

> 16V(the positive leg in the signal that goes to the box(shilded, not  

> the ground) and the negative in the RCA female conetcor tha gives  

> videocomposite signal out) and it works great! {see image in  

> Mitsubishi TV set from Brazil in http://m244. photobucket. com/  

> albumview/albums/ vtrucco/testes/ DSC02256.jpg. html? )

>

> He told me to get the NTSC signal I only need to change the Xtal  

> crital to 3.579545, he has a lot of expertise in hardware from  

> Sinclair, MSX, Amiga, TandyColor(coco) , videogames(lot from  

> Atari2600, odyssey2,colecovisi on,SegaMegadrive ,SegaGenesis,  

> NES,SNES, etc.).

>

> He recently buil a cartige emulator[with PIC processor] to use in  

> all kind of 8bit computers(sinclair Spectrum48,MSX, atari800, C64)  

> and videogames(odyssey2 ,Atari2600, Atari5200,  

> SegaMasterSystem ,gameboy) and has tutorials in the internet of how  

> to build cartiges to use on it.

> Its a great hardware and he made one for me, still need to make the  

> cartridges from the instructions to make mine work.

>

> You can see the instruction to build(portuguese of course,easy to  

> translate): cartridge for master system (sega) in http://www.  

> instructables. com/id/Emulador_ de_Cartucho_ Master_System/

> or cartridge for Magnavox Odyssey2 in http://www. instructables. com/ 

> id/Emulador_ de_Cartucho_ Odyssey/ or cartridge for MSX in http:// 

> www. instructables. com/id/Emulador_ de_Cartucho_ MSX/ or cartridge  

> for TRS Color (coco) in http://www. instructables. com/id/Emulador_  

> de_Cartucho_ CP400/ or cable(old floppy) for the emulator in http://www 

> . instructables. com/id/Cabo_ para_o_Emulador_ de_Cartucho/ or The  

> Emulator itself in http://www. instructables. com/id/Emulador_  

> de_Cartucho_ Montagem/ or cartridge for Atari2600 in http:// www.  

> instructables. com/id/Emulador_ de_Cartucho_ Atari_2600/ or  

> cartridge for Sinclair Spectrum in http://www. instructables. com/id/ 

> Emulador_ de_Cartucho_ TK90X/

>

> Enjoy all...

>

> Has video in youtube also showing how it works in:

> http://www. youtube.com/ watch?v=sHuRIzfn XhQ&feature= channel_ page

> or more pictures in

> http://s244. photobucket. com/albums/ gg28/vtrucco/ Emulador%20de%  

> 20Cartucho/

>

> He knows what he is talking about....

>

> Oscar

>

>

> crital frequency (chage coma to point)

> 3,579545 (NTSC USA 60Hz), 3,575611 (Pal-M BRAZIL 60Hz) e 3,582056  

> (Pal-N Argentina and Uruguay 50Hz)

>

> --- On Thu, 4/9/09, Fred <fredm@spamcop. net> wrote:

>

> From: Fred <fredm@spamcop. net>

> Subject: Re: [ts2068] Re: NTSC Spectrum

> To: ts2068@yahoogroups. com

> Date: Thursday, April 9, 2009, 11:44 PM

>

> Hi Oscar,

> I don't see how this can be true. The ULA generates the interrupts of

> which there are 50/sec in PAL land and 60/sec in NTSC land. It also

> has to generate the correct number of lines in the output image; 263

> or so in NTSC land vs 312 in PAL land.

>

> Note this is also how the Timex clones work - the NTSC TS2068 has a

> different SCLD to the PAL TS2068/TC2048. The Timex technical spec

> describes exactly how the counters in the SCLD directly drive the

> generation of lines and times for the video output.

>

> Unlike the ZX81 there doesn't appear to be any external configuration

> that would allow these differences to be configured in jumpers or the

> like. It appears to me that also now know that the ULA used in these

> machines are not the same ones used in the PAL versions.

>

> I expect that producing an NTSC Spectrum involves: correct ULA,

> correct master clock (14.11MHz for NTSC, 14MHz for PAL), correct

> colour burst clock and correct video signal encoder for PAL or NTSC.

>

> Thanks,

> Fred

>

> On 10/04/2009, at 6:43, Oscar Arthur Koepke wrote:

> > The ULA from both systems is the same...

> >

> > It don't get tv signal it is outside the ULA like LM18xx.

> > The secret is the XTAL cristal frequency and some minor adjustments

> > to get a channel in VHF not UHF.

> >

> > ULA give you VIEDOCOMPONENT SIGNALS not even RGB or RF signals its

> > all outside the chip near the RF Shielded box or even inside...(in

> > normal ZX Spectrum48Kb PAL-G the signal that gos to the BOX is

> > VIDEOCOMPOSITE signal in PAL-G).

> >

> >

> >

> > --- On Thu, 4/9/09, zxbruno <zxspectrum128@ gmail.com> wrote:

> >

> > From: zxbruno <zxspectrum128@ gmail.com>

> > Subject: [ts2068] Re: NTSC Spectrum

> > To: ts2068@yahoogroups. com

> > Date: Thursday, April 9, 2009, 12:01 PM

> >

> > I'm so glad to have "found" Claudio! Thank you so much for wanting

> > to help.

> >

> > I quote a message sent to me by Chris Smith (which is working on the

> > ULA book and the Harlequin clone):

> >

> > "Chris Smith to me

> > 7:14 AM (36 minutes ago)

> >

> > Can you get any of your known NTSC owning people to run a suite of

> > test

> > programs? (see wos thread for details).

> >

> > http://www.worldofs pectrum.org/ forums/showthrea d.php?t=24446

> >

> > Particularly phil's fusetest.

> > Any other tests would be useful, should we compile a list???

> >

> > Photos of the result screens would be excellent.

> >

> > It would be revealing to compare the Chile machine against the US

> > owned

> > prototype, to see if they are different.

> >

> > A much better idea, and something that does not require opening

> > anything!"

> >

> > --- In ts2068@yahoogroups. com, Claudio Bernet <cbernetp@.. .>  

> wrote:

> > >

> > > Fred,

> > >

> > > I dont know a bit about electronics and nothing about z80

> > programming. But, if you send me some program to run, surely I can

> > help. I have time this weekend.

> > >

> > > If you need some more shots or what ever that may help, just ask.

> > >

> > > Regards

> > > Claudio

> > >

> > >

> > >

> > >

> > >

> > >

> > > --- On Thu, 4/9/09, Fred <fredm@...> wrote:

> > >

> > > From: Fred <fredm@...>

> > > Subject: Re: [ts2068] re: NTSC Spectrum

> > > To: ts2068@yahoogroups. com

> > > Date: Thursday, April 9, 2009, 4:18 PM

> > >

> > >

> > >

> > >

> > >

> > >

> > >

> > >

> > > Hi Claudio,

> > > Are you in a position to run some test code on the Spectrum so

> > that we

> > > can extract the timing details for this NTSC ULA?

> > >

> > > Thanks,

> > > Fred

> > >

> > > On 07/04/2009, at 2:21, Claudio Bernet wrote:

> > >

> > > > Oscar,

> > > >

> > > > Hello. Look, I don't know a bit about electronics, but note that

> > the

> > > > TV output is not modded, this model was constructed with NTSC

> > > > output. The kempton port is a mod, maded 15 years ago, don't  

> have

> > > > schematics of that, but I think it's a simple mod, sure you can

> > find

> > > > some googling.

> > > >

> > > > I will take some shots of the RF interior this night, if someone

> > > > here need a special take please just post here.

> > > >

> > > > Regards

> > > > Claudio

> > > >

> > > >

> > > >

> > > > --- On Mon, 4/6/09, Oscar Arthur Koepke <oscarkoepke@ yahoo.com>

> > wrote:

> > > > From: Oscar Arthur Koepke <oscarkoepke@ yahoo.com>

> > > > Subject: Re: [ts2068] re: NTSC Spectrum

> > > > To: ts2068@yahoogroups. com, "Claudio Bernet" <cbernetp@yahoo.

> > com>

> > > > Date: Monday, April 6, 2009, 6:25 PM

> > > >

> > > > Hi There, Claudio.

> > > >

> > > > I'm from Brazil and I have 2(units) of Sinclair ZX Spectrum48k  

> but

> > > > can't put it to work because they are bolth from UK in  

> PAG_I(PAL-

> > G)

> > > > channel 36 UHF I Have found a way to get videocomposite out but

> > > > still in PAL-G.

> > > > Here in Brazil we have TV sets with tri video sistems NTSC(from

> > > > USA), PAL-M(BRAZIL) and PAL-N(from Uruguay and Argentina).

> > > > So you NTSC modification will work fine around here...

> > > >

> > > > Can you give a closer photo shot(CloseUP) from the inside of the

> > RF

> > > > shilded box from your Speccy48k?

> > > > Have you some schematics(from the Circuits) from these

> > > > modifications( both TV NTSC output and KempstoneJoystick) to  

> share

> > > > with all users from the Group here in Yahoo! ??

> > > >

> > > > Thanks,

> > > >

> > > > OSCAR KOEPKE

> > > > BRAZIL

> > > >

> > > > --- On Sun, 4/5/09, Claudio Bernet <cbernetp@yahoo. com> wrote:

> > > >

> > > > From: Claudio Bernet <cbernetp@yahoo. com>

> > > > Subject: Re: [ts2068] re: NTSC Spectrum

> > > > To: ts2068@yahoogroups. com

> > > > Date: Sunday, April 5, 2009, 10:12 PM

> > > >

> > > > Hi all,

> > > >

> > > > In order to help zxbruno, this are photos of my NTSC speccy  

> (48k).

> > > >

> > > > I'am from Chile (excuse my lack of english)... I have two ntsc

> > > > speccys: my old one modded with a kempston port (photos) and

> > another

> > > > mint one for my collection.

> > > >

> > > > In Chile, mid-80's, the zx-spectrum was not a very succesful

> > machine

> > > > in the markets, but a few ones love it. Atari 8 bit line was the

> > > > winner in those days. I think in my country were imported about

> > 5000

> > > > 48k ntsc speccys... later, Sinclair Chile imported the Timex

> > > > Computer 2048 and the brazilian TK90X. Obviuosly, the silver TS

> > > > 2068, but thats a different machine as all we know.

> > > >

> > > > Well, hope this help this great group to find some answers.

> > > >

> > > > Don't bother to ask me some questions.

> > > >

> > > > Good waves from Chile.

> > > >

> > > > Claudio

> > > >

> > > >

> > > >

> > > >

> > > >

> > > > --- On Sun, 4/5/09, zxbruno <zxspectrum128@ gmail.com> wrote:

> > > > From: zxbruno <zxspectrum128@ gmail.com>

> > > > Subject: [ts2068] re: NTSC Spectrum

> > > > To: ts2068@yahoogroups. com

> > > > Date: Sunday, April 5, 2009, 4:46 PM

> > > >

> > > > Al Hartman wrote: "I don't know where it came from exactly,  

> but I

> > > > have an NTSC Spectrum.

> > > >

> > > > It's labeled Sinclair, and NOT Timex/Sinclair.

> > > >

> > > > I don't know where Stuart got it from, except possibly from  

> Timex

> > > > Portugal or from his contact who bought a warehouse full of  

> Timex

> > > > stock which were returns from Deptartment stores and the like."

> > > >

> > > > Hi Al.

> > > >

> > > > Although some of us already have European Spectrums connected to

> > > > Multi-System TVs or PC video capture cards, the mistery remains.

> > We

> > > > know it needed more than one NTSC TV modulator to work over

> > here. I

> > > > would like to know if the ULA is different and what's written on

> > top

> > > > of it (because the video signal originates there first), how did

> > > > they solve the timing issues, etc.

> > > >

> > > > I dedicated many hours to search engines trying to find

> > information

> > > > about NTSC ZX Spectrums in the U.S. and Chile. It seems you're  

> our

> > > > only hope for answers...

> > > >

> > > > Could you please, at some point, provide a picture of the  

> board of

> > > > that Spectrum for us to study? It won't give us all the answers,

> > but

> > > > it will provide clues and satisfy our curiosity.

> > > >

> > > >

> > > >

> > > >

> > > >

> > > >

> > > >

> > >

> >

> >

> >

> >

> >

> >

>

>

>

>

>

>

>

>

35. Re: [ts2068] Re: NTSC Spectrum ...and Thanx for the Tech...

oscarkoepke · Sat, 11 Apr 2009 13:54

Hi there again.. 

I'm sorry if it sound offensive or even rude(I apologise) , it's not suppose to be...is suppose to be practical.... not really so in theory.

Than I spoke to Victor and he gave me also a theorical and better technical explanation on the subject. And corrected me,yes I was WORNG, that only replace the cristal for the ntsc frequency will not make it work in color.

Than he explained me how PAL-M was made...in the seventies the NTSC had some problems and in europe the PAL has show up really better than NTSC, with 100lines more and use fase rotation in color signal to correct distortions and bad transmition of immages...
So here in Brazil, the military decided(Was DITATORIAL MILITARY TIMES) to use the good qualites from PAL like fase rotation in color, but cound not use the 100 lines more because the timming of the circut to make it less expensive was the line frequency(here is 60Hz like in US, and in europe was 50Hz) so they combine 525lines from NTSC and fase rotaion in color used by PAL and created the PAL-M system.

So the trick to use it in Spectrum is to change the cristal so the TV set thinks is pal-m but with some lines added... so these tv(mitsubishi) make the compensation fiting the image in the screen, but with others(TVs) you need to adjust the high of the image with internal trimpots.

To make it work in NTSC tv you need more than change the cristal... you need to change the fase of color, in older tvs(from the 80s) would flicker the color(because in 1/4 of the time the color is right, in theory).

Now I think I was helpfull...

Oscar

--- On Sat, 4/11/09, zxbruno <[email]> wrote:

From: zxbruno <[email]>
Subject: [ts2068] Re: NTSC Spectrum  ...and Thanx for the Tech...
To: [email]
Date: Saturday, April 11, 2009, 4:27 PM

















      You remind me of a certain rude person that made me leave the TK Brasizian group. Maybe you are the same person....

Or shall I ignore your rudeness based on the fact that English isn't your first language?

If you consider these words offensive, re-read your posts as if they were written my someone else!



--- In ts2068@yahoogroups. com, Oscar Arthur Koepke <oscarkoepke@ ...> wrote:

>

> I don't know what is the meanig of all these talk .....



To understand how NTSC Spectrums (made by Siclair itself) were made. There are historical motives, preservation motives and personal motives. It is important to many and others.



> Is it not to have a signal output that we all can use in NTSC with god image and color?



No. While I'm thankful for the information you provided, that's not the main goal. I explained myself above, but you have to understand how important the Book on the Ferranti ULA will be. We want to find out how they did things, not just how to hack it to make it work today.



> ....or to have some eletronic expertise diploma to sow how mutch teory e of us know....

> 

> Working is the only intent.... not to have some Ph.D. in the theory...



*sigh*



> So if it is or not NTSC really doen't bother me ....or enyone in thes list.



You're talking for everyone else?



> But if it works in NTSC TV SETs in color that really mather...



If it works then it's really, really nice. But we want to understand what was done in the past and document everything. I for one won't get any credit, but I appreciate all the hard work of people who are doing these things, and help as much as I can.



> 

> A GOOD EXEMPLE: The Apple II plus works in NTSC but never realy was a NTSC signal(Steve Zorniac had to cheat the NTSC signal).... so who Fxxxxxx CARES!!!

> 

> And the Y, B-Y and R-Y they are relly a kind of composte signal....aren' t they?



If you consider we're bothering you please stay away from this topic. But if you want to help us with your knowledge please consider doing it in a civilized manner.

36. Re: NTSC Spectrum ...and Thanx for the Tech...

zxbruno · Sat, 11 Apr 2009 19:27

You remind me of a certain rude person that made me leave the TK Brasizian group. Maybe you are the same person....
Or shall I ignore your rudeness based on the fact that English isn't your first language?
If you consider these words offensive, re-read your posts as if they were written my someone else!

--- In [email], Oscar Arthur Koepke <oscarkoepke@...> wrote:
>
> I don't know what is the meanig of all these talk .....

To understand how NTSC Spectrums (made by Siclair itself) were made. There are historical motives, preservation motives and personal motives. It is important to many and others.

> Is it not to have a signal output that we all can use in NTSC with god image and color?

No. While I'm thankful for the information you provided, that's not the main goal. I explained myself above, but you have to understand how important the Book on the Ferranti ULA will be. We want to find out how they did things, not just how to hack it to make it work today.

> ....or to have some eletronic expertise diploma to sow how mutch teory e of us know....
> 
> Working is the only intent.... not to have some Ph.D. in the theory...

*sigh*

> So if it is or not NTSC really doen't bother me ....or enyone in thes list.

You're talking for everyone else?

> But if it works in NTSC TV SETs in color that really mather...

If it works then it's really, really nice. But we want to understand what was done in the past and document everything. I for one won't get any credit, but I appreciate all the hard work of people who are doing these things, and help as much as I can.

> 
> A GOOD EXEMPLE: The Apple II plus works in NTSC but never realy was a NTSC signal(Steve Zorniac had to cheat the NTSC signal).... so who Fxxxxxx CARES!!!
> 
> And the Y, B-Y and R-Y they are relly a kind of composte signal....aren't they?

If you consider we're bothering you please stay away from this topic. But if you want to help us with your knowledge please consider doing it in a civilized manner.

37. Re: NTSC Spectrum ...and Thanx for the Tech...

Al Hartman · Sun, 12 Apr 2009 09:29

There.s no such person as Steve Zorniac. It's Steve Wozniac. Apple IIs 
had no RF output, you had to buy a device called a Sup'r Mod to add RF 
output to the unit.

Apple II's were made with NTSC and PAL/Secam Composite outputs and one 
would buy the appropriate Sup'r Mod for your country. Though most people 
I knew bought Composite B/W monitors which were made to monitor 
Surveillance cameras.

All of this discussion is important because a Spectrum clone will have 
to be switchable between NTSC and PAL formats so enough units can be 
made and sold to make the production worthwhile.

Being that the Spectrum is a uniquely British computer, it would be 
wrong to keep British enthusiasts from being able to buy one. Not to 
mention those in Northern Europe and South America who had clones of the 
Spectrum as well.

If a Spectrum Clone is being made, count me in for one.

Al

38. Re: NTSC Spectrum ...and Thanx for the Tech...

cheveron · Sun, 12 Apr 2009 16:48

Thousands of Spectrum clones have been made, mostly in former communist countries in the late '80s and early '90s. There have been several home-brew projects since then, but the most interesting one of which for US users is probably the Harlequin SE.

http://www.zxdesign.info/book/

Chris has already got a working plug-in replacement for the UK ULA. With the research he's done he should be able to modify UK machines by removing the old ULA (which can then be used to fix dead machines) and inserting a replacement that generates the NTSC signal required by the US. You still have to mess around with the modulator to sort out the colour but it looks as if it should be relatively straight-forward.

The Harlequin SE is a timing perfect clone of the original Spectrum 48K, but it will include support for my Spectrum SE project, and that in turn can emulate a Timex 2068. It will also run 128K software, so you get the best of all worlds.

Chris still has a book to finish writing before he gets back to electronics though so don't all rush to order. :)

--- In [email], Al Hartman <alhartman6@...> wrote:

> If a Spectrum Clone is being made, count me in for one.

39. Re: [ts2068] Re: NTSC Spectrum ...and Thanx for the Tech...

Oscar Arthur Koepke · Sun, 12 Apr 2009 21:55

I heard that in South Corea the ZX Spetrum 48kb was very well used(lots of units)... If I'm not mistaken the Tv system there was NTSC also, any information in that ULA can be a great found....

--- On Sun, 4/12/09, Al Hartman <[email]> wrote:

From: Al Hartman <[email]>
Subject: [ts2068] Re: NTSC Spectrum  ...and Thanx for the Tech...
To: [email]
Date: Sunday, April 12, 2009, 10:29 AM

















      There.s no such person as Steve Zorniac. It's Steve Wozniac. Apple IIs 

had no RF output, you had to buy a device called a Sup'r Mod to add RF 

output to the unit.



Apple II's were made with NTSC and PAL/Secam Composite outputs and one 

would buy the appropriate Sup'r Mod for your country. Though most people 

I knew bought Composite B/W monitors which were made to monitor 

Surveillance cameras.



All of this discussion is important because a Spectrum clone will have 

to be switchable between NTSC and PAL formats so enough units can be 

made and sold to make the production worthwhile.



Being that the Spectrum is a uniquely British computer, it would be 

wrong to keep British enthusiasts from being able to buy one. Not to 

mention those in Northern Europe and South America who had clones of the 

Spectrum as well.



If a Spectrum Clone is being made, count me in for one.



Al

40. Re: [ts2068] Re: NTSC Spectrum

Fred · Tue, 14 Apr 2009 16:03

Hi Bruno,
I'd say the most interesting programs at this point are the newest  
fusetest.tap which doesn't crash with Claudio's NTSC Spectrum any more  
to detect the frame length (and may soon be enhanced to do some more  
relevant tests), and the firstcontention.tap first contention finder.

There may be a couple more as we drill down a little further into the  
details of Claudio's machine so if you are making a real tape for Al  
it would probably make sense to wait a little till we've got all the  
details down.

Fred

On 14/04/2009, at 14:45, zxbruno wrote:

>
>
> Oscar: Apologies accepted.
>
> Those still interested in this topic please follow the latest  
> developments here:
>
> http://www.worldofspectrum.org/forums/showthread.php?t=24446
>
> Al: If you would like to help us the same way Claudio is helping,  
> but without opening the prototype, please e-mail me and I'll send  
> you the programs. I'll even send you a cassette by mail with the  
> programs if it's necessary, just to make it as easy as possible for  
> you. This would help Chris create the clone you said to be  
> interested in.
>
> Fred, if Al decides to help the effort and run some tests on the  
> prototype, which ones should he run?
>
>
>

41. Re: NTSC Spectrum

zxbruno · Tue, 14 Apr 2009 04:45

Oscar: Apologies accepted.

Those still interested in this topic please follow the latest
developments here:

http://www.worldofspectrum.org/forums/showthread.php?t=24446

Al: If you would like to help us the same way Claudio is helping, but
without opening the prototype, please e-mail me and I'll send you the
programs. I'll even send you a cassette by mail with the programs if
it's necessary, just to make it as easy as possible for you. This would
help Chris create the clone you said to be interested in.

Fred, if Al decides to help the effort and run some tests on the
prototype, which ones should he run?

42. Re: NTSC Spectrum

Al Hartman · Tue, 14 Apr 2009 09:12

Since I don't know where the unit is right now, I can't do any testing.

If I find it someday, I'd be glad to run test software on it.

Due to my current physical limitations, I can't go through the boxes in 
my closet by myself.

I'm moving sometime later this year, so it might turn up then.

Al

P.S.: If you search for ZX Spectrum on ebay, several Spectrum clones 
show up.

43. NTSC Timex 2048?

Timex · Mon, 8 Jun 2009 11:51:

I have found the Timex Computer 2048 Service Manual and it describes  
the crystal frequency for the different TV systems for color output:

PAL M -> Crystal X1 3.5756611 Mhz
PAL N -> Crystal X1 3.5820 Mhz
PAL B/G -> Crystal X1 4,431619 Mhz
NTSC -> Crystal X1 3.579545 Mhz

44. Re: [ts2068] Re: NTSC Timex 2048?

Oscar Arthur Koepke · Mon, 8 Jun 2009 13:17:

It(TS2068) was very well in selling in Argentina(PAL-N), that shoud be a good reason for these information.

Oscar Koepke

--- On Mon, 6/8/09, [email] <[email]> wrote:

From: [email] <[email]>
Subject: [ts2068] Re: NTSC Timex 2048?
To: [email]
Date: Monday, June 8, 2009, 3:35 PM

















      Interesting. Maybe it relates to the original Timex Sinclair TS2048 which was dropped in favour of the TS2068. It seems plausible that the Portuguese machine was based on the US one, but that would mean that Timex had always been planning to extend the video modes.



--- In ts2068@yahoogroups. com, "Johnny Red (Timex)" <timex.pt@.. .> wrote:

>

> I have found the Timex Computer 2048 Service Manual and it describes  

> the crystal frequency for the different TV systems for color output:

> 

> PAL M -> Crystal X1 3.5756611 Mhz

> PAL N -> Crystal X1 3.5820 Mhz

> PAL B/G -> Crystal X1 4,431619 Mhz

> NTSC -> Crystal X1 3.579545 Mhz

>

45. Re: [ts2068] Re: NTSC Timex 2048?

Hernán Pablo Alvarez · Mon, 8 Jun 2009 17:25:

Oscar, the TS2068 sold in Argentina are all NTSC and even comes with 110V
power supplies when we use 220V.

--
Hernán Alvarez
[email]


2009/6/8 Oscar Arthur Koepke <[email]>

>
>
>   It(TS2068) was very well in selling in Argentina(PAL-N), that shoud be a
> good reason for these information.
>
> Oscar Koepke
>
> --- On *Mon, 6/8/09, [email] <[email]>* wrote:
>
>
> From: [email] <[email]>
> Subject: [ts2068] Re: NTSC Timex 2048?
> To: [email]
> Date: Monday, June 8, 2009, 3:35 PM
>
>  Interesting. Maybe it relates to the original Timex Sinclair TS2048 which
> was dropped in favour of the TS2068. It seems plausible that the Portuguese
> machine was based on the US one, but that would mean that Timex had always
> been planning to extend the video modes.
>
> --- In ts2068@yahoogroups. com<http://mc/compose?to=ts2068%40yahoogroups.com>,
> "Johnny Red (Timex)" <timex.pt@.. .> wrote:
> >
> > I have found the Timex Computer 2048 Service Manual and it describes
> > the crystal frequency for the different TV systems for color output:
> >
> > PAL M -> Crystal X1 3.5756611 Mhz
> > PAL N -> Crystal X1 3.5820 Mhz
> > PAL B/G -> Crystal X1 4,431619 Mhz
> > NTSC -> Crystal X1 3.579545 Mhz
> >
>
>
> 
>

46. Re: NTSC Timex 2048?

cheveron · Mon, 08 Jun 2009 18:35

Interesting. Maybe it relates to the original Timex Sinclair TS2048 which was dropped in favour of the TS2068. It seems plausible that the Portuguese machine was based on the US one, but that would mean that Timex had always been planning to extend the video modes.


--- In [email], "Johnny Red (Timex)" <timex.pt@...> wrote:
>
> I have found the Timex Computer 2048 Service Manual and it describes  
> the crystal frequency for the different TV systems for color output:
> 
> PAL M -> Crystal X1 3.5756611 Mhz
> PAL N -> Crystal X1 3.5820 Mhz
> PAL B/G -> Crystal X1 4,431619 Mhz
> NTSC -> Crystal X1 3.579545 Mhz
>

47. Re: [ts2068] Re: NTSC Timex 2048?

Oscar Arthur Koepke · Tue, 9 Jun 2009 14:11:

That's brobably the rason why they add these info in the technical manual from the TC2048(come out later than the TS2068). 
Maybe they were willing to sell these new model in Argentina also...with the TV output mod included...Good gess!

Oscar A. Koepke

--- On Mon, 6/8/09, Hernán Pablo Alvarez <[email]> wrote:

From: Hernán Pablo Alvarez <[email]>
Subject: Re: [ts2068] Re: NTSC Timex 2048?
To: [email]
Date: Monday, June 8, 2009, 5:25 PM

















      Oscar, the TS2068 sold in Argentina are all NTSC and even comes with 110V power supplies when we use 220V. 

--
Hernán Alvarez
hernan.alvarez@ gmail.com




2009/6/8 Oscar Arthur Koepke <oscarkoepke@ yahoo.com>












It(TS2068) was very well in selling in Argentina(PAL- N), that shoud be a good reason for these information.

Oscar Koepke

--- On Mon, 6/8/09, cheveron@ymail. com <cheveron@ymail. com> wrote:



From: cheveron@ymail. com <cheveron@ymail. com>

Subject: [ts2068] Re: NTSC Timex 2048?
To: ts2068@yahoogroups. com
Date: Monday, June 8, 2009, 3:35 PM 





Interesting. Maybe it relates to the original Timex Sinclair TS2048 which was dropped in favour of the TS2068. It seems plausible that the Portuguese machine was based on the US one, but that would mean that Timex had always been planning to extend the video modes.


--- In ts2068@yahoogroups. com, "Johnny Red (Timex)" <timex.pt@.. .> wrote:

>
> I have found the Timex Computer 2048 Service Manual and it describes 
> the crystal frequency for the different TV systems for color output:
> 
> PAL M -> Crystal X1 3.5756611 Mhz
> PAL N -> Crystal X1 3.5820 Mhz

> PAL B/G -> Crystal X1 4,431619 Mhz
> NTSC -> Crystal X1 3.579545 Mhz
>

48. Re: [ts2068] Re: NTSC Timex 2048?

Oscar Arthur Koepke · Wed, 10 Jun 2009 08:25

Hi Paulo.

Can you give these web site?
Thanks

Oscar
Brasil

--- On Wed, 6/10/09, Paulo Leite <[email]> wrote:

From: Paulo Leite <[email]>
Subject: [ts2068] Re: NTSC Timex 2048?
To: [email]
Date: Wednesday, June 10, 2009, 11:35 AM

















      Hi all,



Both the TC2048 and the TC2068 were built to work on different systems. I know because I have one of the black TC2068 computers built in Portugal, which I easily changed to work in NTSC/60Hz by moving two jumpers and changing the crystal. Jarek had on his site the schematics for the TC2068, and it clearly shows the existence of these jumpers.



Paulo Leite



--- In ts2068@yahoogroups. com, "Johnny Red (Timex)" <timex.pt@.. .> wrote:

>

> I have found the Timex Computer 2048 Service Manual and it describes  

> the crystal frequency for the different TV systems for color output:

> 

> PAL M -> Crystal X1 3.5756611 Mhz

> PAL N -> Crystal X1 3.5820 Mhz

> PAL B/G -> Crystal X1 4,431619 Mhz

> NTSC -> Crystal X1 3.579545 Mhz

>

49. Re: NTSC Timex 2048?

Paulo Leite · Wed, 10 Jun 2009 14:35

Hi all,

Both the TC2048 and the TC2068 were built to work on different systems. I know because I have one of the black TC2068 computers built in Portugal, which I easily changed to work in NTSC/60Hz by moving two jumpers and changing the crystal. Jarek had on his site the schematics for the TC2068, and it clearly shows the existence of these jumpers.

Paulo Leite

--- In [email], "Johnny Red (Timex)" <timex.pt@...> wrote:
>
> I have found the Timex Computer 2048 Service Manual and it describes  
> the crystal frequency for the different TV systems for color output:
> 
> PAL M -> Crystal X1 3.5756611 Mhz
> PAL N -> Crystal X1 3.5820 Mhz
> PAL B/G -> Crystal X1 4,431619 Mhz
> NTSC -> Crystal X1 3.579545 Mhz
>

50. Re: NTSC Timex 2048?

Paulo Leite · Wed, 10 Jun 2009 15:37

Oscar,

Jarek's web site is http://8bit.yarek.pl/

The site can be a little confusing, but I know the schematics are there - somewhere.

Paulo Leite

--- In [email], Oscar Arthur Koepke <oscarkoepke@...> wrote:
>
> Hi Paulo.
> 
> Can you give these web site?
> Thanks
> 
> Oscar
> Brasil
> 
> --- On Wed, 6/10/09, Paulo Leite <pdsleite@...> wrote:
> 
> From: Paulo Leite <pdsleite@...>
> Subject: [ts2068] Re: NTSC Timex 2048?
> To: [email]
> Date: Wednesday, June 10, 2009, 11:35 AM
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
>     
>             
>             
> 
> 
>       
>       Hi all,
> 
> 
> 
> Both the TC2048 and the TC2068 were built to work on different systems. I know because I have one of the black TC2068 computers built in Portugal, which I easily changed to work in NTSC/60Hz by moving two jumpers and changing the crystal. Jarek had on his site the schematics for the TC2068, and it clearly shows the existence of these jumpers.
> 
> 
> 
> Paulo Leite
> 
> 
> 
> --- In ts2068@yahoogroups. com, "Johnny Red (Timex)" <timex.pt@ .> wrote:
> 
> >
> 
> > I have found the Timex Computer 2048 Service Manual and it describes  
> 
> > the crystal frequency for the different TV systems for color output:
> 
> > 
> 
> > PAL M -> Crystal X1 3.5756611 Mhz
> 
> > PAL N -> Crystal X1 3.5820 Mhz
> 
> > PAL B/G -> Crystal X1 4,431619 Mhz
> 
> > NTSC -> Crystal X1 3.579545 Mhz
> 
> >
>

Indexed under

ZX Spectrum · Timex Computer (European: TC2048/3256) · Video upgrades (composite, RGB, HDMI)