901447-30_2001diag_0000.bin seems to disassemble nicely at $9800, and http://mhv.bplaced.net/cbmroms/cbmroms.php lists "901447-30" as a "Diagnostic Clip" for PET 2001, to be located at 9800-9FFF. Incidentally, the code around $9979 seems to load bytes from $99ce to $99d8 to screen memory, so maybe someone more patient than I can figure out what it says? I suspect the entire block between $9985 and $99d8 is screen text, actually. 901484-03-2031ro_c000.bin seems to match "901484-03" on the same page, which describes it as DOS 2.6 Low for the 2031 drive, to load at c000. There's a copy of that ROM on http://www.zimmers.net/anonftp/pub/cbm/firmware/drives/old/2031/index.html, however, which seems to have nothing in common with this one. So that's strange. /Hans On 2021-09-06 21:39, Hans Liss wrote: > > Better link: > http://www.zimmers.net/anonftp/pub/cbm/firmware/misc/unknown/ > > The low count of "a9" bytes in several of these is a sure sign it's > not 6502 code. I took a quick look at a few: > > * 8in-cpm-trbdos.bin is definitely Z80 code (or 8085, perhaps?). A > CPM "driver" for 8-inch floppies, perhaps? > * 740turbo1-1.bin is also Z80 code. > * I suspect ultima-ii-v1-73.bin is also Z80 code. > * create-new-base.bin and 40-80-60h.bin seem to be something else, > like not program code at all. > > I found a fairly useful disassembler at > https://onlinedisassembler.com/odaweb/, by the way. I tend to use > wfdis for 6502 code, but this one has many other architectures and > accepts small hex dumps as input. > > /Hans > > On 2021-09-06 19:23, Bo Zimmerman wrote: >> Hello all, >> >> Dave McMurtrie contributed a nice pile of PET option rom images to >> the funet/zimmers archive _at_ >> http://www.zimmers.net/.../computers/pet/other/index.html >> >> I had no trouble identifying and classifying most of them. However, >> there were several that I could either not get working, properly >> disassembled,, or just couldn't identify. This is fairly new to me, >> so I created a special place for them here: >> http://www.zimmers.net/ano.../pub/cbm/firmware/misc/unknown/ >> >> If anyone out there enjoys digital archeology, I'd ask you to give a >> second or third opinion on some of those unknown roms. It's possible >> the eproms were just corrupt or unreadable, but I'd sure like someone >> else to concur before I throw any of the images out. >> >> - Bo Zimmerman >> >>Received on 2021-09-06 23:00:04
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