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

From: Philip Lord <>
Date: Tue, 24 Nov 2009 17:18:04 +0900
Message-id: <>
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  

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.


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
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Received on 2009-11-25 08:30:03

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