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Source for ROM images for PET 6540-x ROMS

M

Moondog

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Michigan
Where can I find ROM images for the 6540 series ROMS, especially the 6540-11 character ROM? Awhile you all helped me find a link to find a replacement ROM adapter, and when I can find a ROM image I'll order the adapter and replacement ROM.

Thanks!
 
The binaries are listed here: http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/

For the 6540 ROMs the listing is confusing. You want to use the series that are named ROM-3-C000.901439-13.bin towards the bottom of the long list. There are seven files needed for the BASIC2 with the IEEE-488 port working.

As for the character ROM, I think you need the file called " Character-1.901447-08.bin which I think is the same as 6540-11. Can someone please verify?
 
dave_m said:
The binaries are listed here: http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/

For the 6540 ROMs the listing is confusing. You want to use the series that are named ROM-3-C000.901439-13.bin towards the bottom of the long list. There are seven files needed for the BASIC2 with the IEEE-488 port working.

As for the character ROM, I think you need the file called " Character-1.901447-08.bin which I think is the same as 6540-11. Can someone please verify?
Click to expand...
It's definitely confusing, in part because the identical images are listed under two numbers, the 6540 versions (901439-xx AKA 6540-xxx) and the 2316 versions (901447-xx), and to complicate things further the suffix digits are different between the two sets. Then there are the same images combined into 4KB 2332 sets for the dynamic PETs but that's not relevant here ;-)

I think the 901447-08 CG ROM is AKA 901439-08 and 6540-010 (6540-011 is the original $C000-$C7FF ROM, replaced by 6540-019).

But I think with BASIC2 you'd be better off with the 90447-10 image; this caused confusion even back in the day ;-)
 
MikeS said:
It's definitely confusing, in part because the identical images are listed under two numbers, the 6540 versions (901439-xx AKA 6540-xxx) and the 2316 versions (901447-xx), and to complicate things further the suffix digits are different between the two sets. Then there are the same images combined into 4KB 2332 sets for the dynamic PETs but that's not relevant here ;-)

I think the 901447-08 CG ROM is AKA 901439-08 and 6540-010 (6540-011 is the original $C000-$C7FF ROM, replaced by 6540-019).

But I think with BASIC2 you'd be better off with the 90447-10 image; this caused confusion even back in the day ;-)
Click to expand...

Thanks Mike for this information. One question: will using the 90447-10 default the 2001-8 PET to using lower case and no shifted graphics, similar to the 8032? Of course one can always back and forth to shifted graphics with a POKE command.
-Dave
 
dave_m said:
Thanks Mike for this information. One question: will using the 90447-10 default the 2001-8 PET to using lower case and no shifted graphics, similar to the 8032? Of course one can always back and forth to shifted graphics with a POKE command.
-Dave
Click to expand...
Looks like we both messed up; it's 901447-10 ;-)

Yes, AFAIK they all worked the same way although the -08 was UC/graphics vs. UC/LC for the -10 so the poke essentially worked the opposite way, switching the -08 to UC/LC and the -10 to UC/Graphic.

But I could be wrong; it's been a while ;-)
 
Thank you everybody for your help. I'm sure you all could see where I was confused. I found a source for the rom adapter. My next question is if I could use an inexpensive USB eprom programmer off of Amazon to create the new rom, or is there a certain model or type needed?

By the way, I should have mentioned this is for a US model, and didn't know if the characters were different.
 
Thanks everone! I found a source for the rom adapter and a source for the recommended replacement roms. My next question is if I could buy an inexpensive eprom programmer off of Amazon, or do I need something special?
 
Moondog said:
Thanks everone! I found a source for the rom adapter and a source for the recommended replacement roms. My next question is if I could buy an inexpensive eprom programmer off of Amazon, or do I need something special?
Click to expand...
It depends on the particular EPROMs you're trying to program; many of the newer programmers can not handle some of the old 25/27xxx type EPROMs, especially those requiring 25V Vpp.

What are the make and exact number of the EPROMs you're planning to use, and which adapter(s) are you going to use?
 
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