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 22:03:57
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