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

Yeah, once you mentioned it I see that it's always been there. Looks like 
when the character counters get preloaded for a new line there's some kind 
of glitch; that could be fun, figuring out the timing and decoding in that 
part of the display section.

This PET just ain't gonna give up easily, is it...

mike


----- Original Message ----- 
From: "Philip Lord" <random6000@mac.com>
To: <cbm-hackers@musoftware.de>
Sent: Monday, May 16, 2011 1:57 AM
Subject: Re: PET 2001 fix Part 3 - RAM/ROM board etc.


>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.
>
> Phil
>
>
> 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.
>>
>>
>> --
>>     ___
>>    / __|__
>>   / /  |_/     Groetjes, Ruud
>>   \ \__|_\
>>    \___|       URL: Ruud.C64.org
>>
>>
>>
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