Timex Computer 2068 Spectrum emulator

4 messages · 2006-12-16 → 2007-01-19 · Yahoo Group era · View archive on archive.org

Participants: Richard Atkinson, Senen Racki, cridg35355, zx81ab

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. Timex Computer 2068 Spectrum emulator

Richard Atkinson · Sat, 16 Dec 2006 11:15

I just did some preliminary investigations of the TC2068 Spectrum emulator
cartridge which came with my TC2068. It appears to be a standard Sinclair
Spectrum ROM, not a TC2048 ROM. I did some PEEKs at locations 129A, 129B,
386E and 386F and found 0C0A at the first pair (the location of the PO-MSG
routine) and FFFF at the second pair, indicating that the TC2048 ROM
modifications were not present.

If the cartridge is a 'HOME ROM' then it need not contain routines to set
the F4 register or bit 7 in the FF register, since the Timex ROM banking
scheme is effectively disabled by the presence of the ROM cartridge. It does
not explain, however, how the cartridge deals with the rest of the FF
register.

Richard

2. RE: [ts2068] Timex Computer 2068 Spectrum emulator

Senen Racki · Sat, 16 Dec 2006 12:46

Maybe I was just lucky, or dumb, or both, but.  I just epoxied the (real) Spectrum ROM on
top of the TS ROM and joined all of the pins except power.  I cut the pwr trace to the TS
ROM and routed both the Spectrum ROM pwr and TS pwr pins to a toggle switch, which I
mounted on the side of my case.  If I wanted Spectrum, I'd toggle the switch (while
powered off), and toggle back for TS.  It worked like a charm.



Senen.



Disclaimer:  I was just 11 years old at the time!



  _____  

From: [email] [mailto:[email]] On Behalf Of Richard Atkinson
Sent: Saturday, December 16, 2006 6:16 AM
To: [email]
Subject: [ts2068] Timex Computer 2068 Spectrum emulator



I just did some preliminary investigations of the TC2068 Spectrum emulator cartridge which
came with my TC2068. It appears to be a standard Sinclair Spectrum ROM, not a TC2048 ROM.
I did some PEEKs at locations 129A, 129B, 386E and 386F and found 0C0A at the first pair
(the location of the PO-MSG routine) and FFFF at the second pair, indicating that the
TC2048 ROM modifications were not present. 



If the cartridge is a 'HOME ROM' then it need not contain routines to set the F4 register
or bit 7 in the FF register, since the Timex ROM banking scheme is effectively disabled by
the presence of the ROM cartridge. It does not explain, however, how the cartridge deals
with the rest of the FF register. 



Richard

3. Re: Timex Computer 2068 Spectrum emulator

cridg35355 · Mon, 15 Jan 2007 20:46

--- In [email], "Senen Racki" <Senen@...> wrote:
>
> Maybe I was just lucky, or dumb, or both, but.  I just epoxied the 
(real) Spectrum ROM on
> top of the TS ROM and joined all of the pins except power.  I cut 
the pwr trace to the TS
> ROM and routed both the Spectrum ROM pwr and TS pwr pins to a 
toggle switch, which I
> mounted on the side of my case.  If I wanted Spectrum, I'd toggle 
the switch (while
> powered off), and toggle back for TS.  It worked like a charm.
> 
>  
> 
> Senen.
> 
>  
> 
> Disclaimer:  I was just 11 years old at the time!
> I did the same thing several years ago and I still have all of my 
timex/sinclair stuff:  5 1/4 " floppy drives, interface for large 
parallel printers, cartridges for the 2068, the largest Public domain 
software collection of timex and several spectrum programs. I also 
have lots of ts1000 programs originals in the cassette boxes.
>  
> 
>   _____  
> 
> From: [email] [mailto:[email]] On 
Behalf Of Richard Atkinson
> Sent: Saturday, December 16, 2006 6:16 AM
> To: [email]
> Subject: [ts2068] Timex Computer 2068 Spectrum emulator
> 
>  
> 
> I just did some preliminary investigations of the TC2068 Spectrum 
emulator cartridge which
> came with my TC2068. It appears to be a standard Sinclair Spectrum 
ROM, not a TC2048 ROM.
> I did some PEEKs at locations 129A, 129B, 386E and 386F and found 
0C0A at the first pair
> (the location of the PO-MSG routine) and FFFF at the second pair, 
indicating that the
> TC2048 ROM modifications were not present. 
> 
>  
> 
> If the cartridge is a 'HOME ROM' then it need not contain routines 
to set the F4 register
> or bit 7 in the FF register, since the Timex ROM banking scheme is 
effectively disabled by
> the presence of the ROM cartridge. It does not explain, however, 
how the cartridge deals
> with the rest of the FF register. 
> 
>  
> 
> Richard
>

4. Re: Timex Computer 2068 Spectrum emulator

zx81ab · Fri, 19 Jan 2007 14:13

Bonjour,

  You wrote: "I also have lots of ts1000 programs originals in the 
cassette boxes."

  Could you send me a list of those TS1000 programs?

  Goodby(t)e,  ANDRE***
http://www.zx-team.de/andre
http://zx81.ordi5.free.fr/andre/andre.htm

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Timex Computer (European: TC2048/3256) · Spectrum emulation & software