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

From: Philip Lord <>
Date: Sat, 21 May 2011 08:31:29 +0900
Message-id: <>
Hi again,
It seems that I've haven't gotten a couple of emails in this thread. They contain the messages:

"Excellent analysis!"


"So the summary is: look for a spike in the DIS.ON signal. Maybe even try
to suppress it (temporarly) with a small capacitor to ground to see if the 
problem goes away."

Sorry, I'm not sure who these mails came from, but unfortunately I never received them and only know of their existence from the response from André. Can someone send please forward the missing mails.

Thanks again


On May 21, 2011, at 7:09 AM, André Fachat wrote:

>> Excellent analysis!
> Thanks, that was a tricky one. I missed the important point only until I realized that the 74100 actually does NOT store the lowest two bits because it handles the upper 8 bits and not the lowest 8 bits of the 10 bit video memory address.
> I only hope it helps. I'm looking forward to the 'scope analysis.
> André
> -- 
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Received on 2011-05-21 00:00:03

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