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

From: Philip Lord <>
Date: Thu, 12 May 2011 22:55:51 +0900
Message-id: <>
> If the character generator ROM is OK (can you test it on the working PET?)

Thanks for your insight. Unfortunately the non working board uses the 2316 masked ROM's and the other one uses the 6540's, so I can't swap them. Fortunately I was able to burn a 2716 and confirm that the original 2316 is dead (FF FF FF...). 

So now I have a screen of random and slightly deformed characters (seems like the same or similar character layout on each start up though), with a pixel flicker through them. I've put pics and a short video up on the same page here:

Strangely enough, just as I pull the power I can see all the characters perfectly for a faction of a second. I've tried to show that in the video.

I still haven't tested D0 on the character ROM to see if it's stuck high. Should I still do this, or does it look like that particular issue has gone now?

Thanks again


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Received on 2011-05-12 14:00:22

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