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

From: M H Stein <>
Date: Wed, 25 Nov 2009 03:21:35 -0500
Message-ID: <01CA6D7E.91329A80@MSE_D03>
I guess it depends on what you want to be able to display simultaneously
with the Katakana symbols. The way you chose to do it means you can't
display all the numbers or punctuation marks at the same time although
you've kept some of the graphic characters.

The way the keyboard is labelled suggests that the Japanese characters
replaced the graphic symbols in the alternate half; of course that means you 
have to shift to type Katakana; no problem on my new style keyboard with 
shift lock, but might be a pain on your chiclet version.

You could of course move the entire normal set (UC, punctuation and numbers)
into the upper (shifted) area and put the Katakana set where you have it now.
Then you'd have to choose whether you want graphics or lower case in the
other half.

I'd use a 4K 2732 and a switch to select 'normal' or 'Japanese'.

I'm curious how your original ROM was arranged; hope Ethan can read it.

BTW, does anyone know: is there an easy way to effectively lock the old style
keyboards in shifted mode?


From: 	Philip Lord[]
Sent: 	Tuesday, November 24, 2009 5:53 AM
Subject: 	Re: PET 2001 Fix....WAS: Will pay good money for NON working PET 2001motherboard.

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

       Message was sent through the cbm-hackers mailing list
Received on 2009-11-25 09:00:04

Archive generated by hypermail 2.2.0.