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

From: Baltissen, GJPAA (Ruud) <>
Date: Mon, 16 May 2011 07:40:22 +0200
Message-ID: <>
Hallo Philip,

> It displays a set of all the characters, then displays the
> inverse set, and repeats. I'm assuming this is correct? 

Yes, but...

> One thing that Ruud's program confirms is that the left most
> column 1 and 2 are repeating:

It shouldn't be caused by my program, AFAIK. That's why I gave the
source as well so you or anyone can check. 
But have a better look:
- not 256 characters are shown but 260.
- column 2,3 and four are a copy of the last three columns (= 3 extra)
- column 1 is a copy of column 2 (or the other way around) (= 1 extra)

My question: did you replace the CPU already? Unless someone comes with
a good explanation, I suspect at least the CPU. And it just takes
seconds to replace and check it.

    / __|__
   / /  |_/     Groetjes, Ruud
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Received on 2011-05-16 06:00:07

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