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

From: Philip Lord <>
Date: Wed, 18 May 2011 19:05:22 +0900
Message-id: <>
Just another quick update for the list:

Ruud, poking and peeking the screen address as you mentioned seems to have normal results.

I fixed the issue with BASIC4 not loading. It turned out to be a funky Flash ROM. I dumped it's contents and could see some problems with the BASIC 4 part. I ended up patching/fixing the original dump and just buying another flash ROM and programing seems to work fine now.

I'm also able to load programs (Android Nim) from C2N datasette, so I know that part now works.

Also built a keyboard cable adaptor for the PET 2001N/3000 keyboard that Anders sent.

Now I think I've only got the weird screen repeat thing to address now and I'm done....I hope

You can see all the pictures on my site as usual.

Thanks again


On May 17, 2011, at 6:16 AM, Philip Lord wrote:

> I've posted another video showing some simple typing tests:
> - typing in 1 thu 9, and repeating
> - followed by repeated returns
> - a CLR command
> - followed by more 1 thu 9 repeated.
> At one point, as the cursor nears the right side, 3 flashing cursors appear!!!
> Phil
> On May 17, 2011, at 1:00 AM, Rhialto wrote:
>> On Mon 16 May 2011 at 13:06:32 +0200, Baltissen, GJPAA (Ruud) wrote:
>>>> I'll hook up a keyboard and reinstall the 6520's to see what happens 
>>>> when I actually start typing something.
>>> In that case you can forget the ASM and use Basic to poke and peek those
>>> addresses I mentioned. Should do the same trick.
>> Or, once you can do some actual typing, just type 40 characters on a
>> line and keep track of whether they appear twice. Especially when you
>> get close to the right side of the screen, it may be that what you're
>> typing starts showing up copied on the next line too.
>> First I had the impression that maybe more or fewer than 40 characters
>> might be present on a line (that would account for some shifting too).
>> But I counted one of the pictures and that seems ok (making it even more
>> mysterious what happens...)
>> -Olaf.
>> -- 
>> ___ Olaf 'Rhialto' Seibert  -- There's no point being grown-up if you 
>> \X/ rhialto/at/    -- can't be childish sometimes. -The 4th Doctor
>>      Message was sent through the cbm-hackers mailing list
>       Message was sent through the cbm-hackers mailing list

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Received on 2011-05-18 11:00:12

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