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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.
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code. The display starts to get initialized. That implies that the
CPU started working and started intitializing parameters. That means,
not the CPU, crystal and much of the buss logic is ok. The buss fault
takes place when initializing the display. I.E. big custom chip that
isn't built anymore. On the other hand, a bad RAM chip could also
cause this is it were at the right address.
IF you can trace what address the cpu is at when the system fails...
that and a look at the memory map should tell you.
Too bad most people don't have the tools to do that.
If you socket the RAM chips and swap them around or replace them and
nothing changes, it's not the RAM. If there are many RAM chips...
swap out the big chip. If it's not socketed... socket it.
Oh, and odds are if your not experienced at desoldering you'll ruin
any chips your remove. Make sure you have good replacements before
you start.
Don't feel bad about getting ripped off... it happens all the time.
I bought an Apple IIc+ that didn't have an internal drive and they
claimed the machine was working.
I just won an Apple III+ on ebay and I'm going to have them test it
further before I spend a bunch on shipping. They tried to imply it
was working but I'm not trusting them with that expensive of shipping.
--- In [email], "David" <ozyr@s...> wrote:
> Well, suffise it to say, but I recently purchased a 2068 off of
ebay. Unfortunately the
> computer is fried (and the jerk who sold it won't refund my money).
>
> The thought crossed my mind that this may be fixable, but I'm not
sure (I'm not an
> expert on the electronics of the 2068).
>
> Here is what I know of the normal 2068 bootup sequence (Yes, I do
remember this).
> 1 - large black and white bars across the screen.
> 2 - after about a second, the screen goes black (except for the border).
> 3 - you then get the copyright notices.
> 3 - the 'K' cursor appears.
>
> So, with this in mind, what could possibly be the problem with my
2068 if it freezes
> during step 1? All I get are black and white bars, and it will not
go any farther?
>
> I'm guessing this is either a RAM or ROM issue (hopefully ROM, as I
may be able to
> get a set of T/S ROM chips - there are two that can be popped out
and replaced
> easily).
>
> Any thought on this?
>
> Thanks
>
> -dave