I padded 901447_30_2001diag_0000.bin out with a 2k block and loaded it in VICE at $9000, so that the ROM ended up at $9800, and then ran "sys 38912". This happened: PET So, clearly it's the Diagnostic Clip 901447-30 for PET 2001. /Hans On 2021-09-06 22:35, Hans Liss wrote: > > I used the VICE monitor to load that block into PET video RAM: > > diagnostic 320350g > > a8-a11 bad > > tv ram ok > > i-ram bad > > z-page ok > > a8-adr bad > > stack ok > > remove clip > > /Hans > > On 2021-09-06 22:14, Hans Liss wrote: >> >> 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 2021-09-07 18:00:04
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