There's plenty of information on the clip here: http://www.6502.org/users/andre/petindex/diag/index.html, including a dump of the ROM that's identical apart from containing an additional 2k of "FF" bytes. /Hans On 2021-09-08 07:11, William Levak wrote: > > My notes say that 901447-30 is diagnostic 320350 for the test fixture > for PETs without a 6545 CRTC. It resides at $9800 in memory. It > requires a jumper block in place of the keyboard and another jumper > block on the user port. The test fixture has a clip that is clipped > over the 6502. The reset button is then pressed and a diagnostic begins. > > I think I have a description of the jumper blocks on zimmers.net, but > I don't remember exactly where. > > On Tue, 7 Sep 2021, Hans Liss wrote: > >> 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 >>>>>> >>>>>> >> > > wlevak_at_sdf.org > SDF Public Access UNIX System - http://sdf.org >Received on 2021-09-08 08:01:52
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