From: Ethan Dicks (ethan.dicks_at_gmail.com)
Date: 2006-07-07 02:17:44
On 7/6/06, r.lagendijk@hccnet.nl <r.lagendijk@hccnet.nl> wrote:
> Hi all,
>
> I made some progress on my 2001... There was a (digital signal) that had
> three levels GND, 2,5 Volts and 5 Volts... the vertical sync
> signal... Now I'm gonna search for the short.
>
> Results on my page:
>
> http://www.xs4all.nl/~lagendr/Diverse/PET2001.htm
Nice job sleuthing. A good reminder that it's not always a failed IC
that's at fault.
As for not starting up properly, I had an 8K PET once that needed
additional support under the middle of the motherboard (previous owner
made a long "V" out of cardboard) to prevent board sag which was
inducing intermittent socket failure in the SRAMs. Essentially,
unless the middle of the board was propped up, zero page was flaky.
Might or might not be your problem, but it's something to consider.
-ethan
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