Re: PET 2001 fix Part 3 - RAM/ROM board etc.

Hi Ruud,
I have a couple of 74LS197's (74177) spare, but I don't want to just start shotgunning the repair as I've noticed these old PET boards lift their traces very easily, and I'd hate to damage something and make things worse. I'd rather keep the board level desoldering and soldering to a minimum if possible. Are there any test I can do with a scope or logic probe that could help me narrow down the bad ic?

Thanks

Phil


On May 18, 2011, at 8:05 PM, Baltissen, GJPAA (Ruud) wrote:

> Hallo Philip,
> 
> 
>> ... the weird screen repeat thing ...
> 
> I suspect one of the two 74177s at D6/D7. See 320132-3.gif that can be
> found at Bo's site.
> 
> 
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