Re: PET 2001 Fix....WAS: Will pay good money for NON working PET 2001 motherboard.

From: Philip Lord <>
Date: Tue, 24 Nov 2009 19:53:33 +0900
Message-id: <>
Just a quick follow up, and a question for the list:
The original character ROM contains two sets of capital letters, and  
on set of lower case. Does anyone know why there are two sets of cap  
Presently I have replaced the lowercase letter set with the new  
Japanese fonts. Hopefully this was the correct thing to do. A poke  
59468,14 should activate them. However you do lose the lowercase  
characters of course. If you believe I have made a mistake, please let  
me know.

I have uploaded to my iDisk server a binary listing of both the  
original ROM and the new Japanese version so you can visually see the  
difference between the two (0's and 1's have been replaced with # and  
_ to increase the visual contrast)


On Nov 24, 2009, at 5:18 PM, Philip Lord wrote:

> Hopefully Ethan can extract something from my Japanese character  
> ROM, but in the mean time I had a few spare hours and decided to  
> make one of my own.
> I haven't tested it as I don't have anything to test it on, but I'm  
> 95% sure it will work. If it does, then I'm guessing it would be  
> very similar, if not identical to the original J ROM that Ethan has.
> I followed Ethan's advice and took the Japanese character set from  
> the VIC-1001 character ROM dump, and spliced it into the PET  
> character ROM for BASIC 2 & 4 (characters-2.901447-10.bin). I know  
> that the BASIC 1 ROM had the lower and uppercase switched (compared  
> to this version), but I'm not exactly sure what this means from a  
> functionality point of view. I have not compared the two on a real  
> (or virtual) machine. Regardless, I can splice the J characters into  
> either version now that I know what to do.
> The process was actually a lot trickier than I fist thought. After  
> splicing the new J characters in by replacing the PET's lowercase  
> fonts and duplicate symbols, I then discovered I had to re-adjust  
> some individual characters that I had inadvertently changed  
> (0,1,2,3,=,+,-,.,/,(up arrow)). These characters relate to keys with  
> no Japanese character assigned to them, and in my initial broad  
> stroke cut and pasting, I had mistakenly changed them all to their  
> equivalent graphic symbol...
> Anyway...would anyone like to test it out for me and give me feedback.
> You can download the .bin file from my idisk server under the 'CBM  
> PET' folder here:
> Here you can also find a photo of my Japanese keyboard for reference.
> Cheers
> Philip
> On Nov 24, 2009, at 7:37 AM, Ethan Dicks wrote:
>> On Mon, Nov 23, 2009 at 5:27 PM, M H Stein <> wrote:
>>> So the question is, why doesn't that CG ROM work?
>> I don't know yet.  I've been out of town the past two weekends, so my
>> evening playtime has been somewhat constrained.  It should be a  
>> little
>> better after this weekend.
>> So far, I have yet to power on that adapter.  I wanted to check out
>> the mainboard first, and it seems to be happy with a real 6540 (of
>> course I can try Jim Brain's 6540 adapter, too.  ;-)
>>> Don't know how to post attachments here, so I'll send you pics off- 
>>> list;
>>> 'good' camera's broken and this one doesn't take very good close- 
>>> ups,
>>> but you'll get the idea. If/when I can take better pics I'll send  
>>> them as
>>> well if you want.
>> Do you have a flatbed scanner?  Are you willing to de-mount the
>> keyboard and scan it?
>> I'll be happy to receive anything legible, though.
>> Thanks,
>> -ethan
>>      Message was sent through the cbm-hackers mailing list
>      Message was sent through the cbm-hackers mailing list

       Message was sent through the cbm-hackers mailing list
Received on 2009-11-25 08:30:16

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