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

From: Philip Lord <>
Date: Mon, 16 May 2011 14:57:14 +0900
Message-id: <>
I can confirm that this double column issue is not caused by your program as it is there before installing your ROM, but was not so noticeable because of the character previous distortion.

I just replaced the CPU, unfortunately there was no change whatsoever.


On May 16, 2011, at 2:40 PM, Baltissen, GJPAA (Ruud) wrote:

> 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.
> --
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Received on 2011-05-16 06:00:13

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