Re: Second Opinion on unknown PET option roms

From: Steve Gray <sjgray_at_rogers.com>
Date: Mon, 6 Sep 2021 16:23:27 -0400
Message-Id: <54FCD92C-59CD-49EF-8AF4-73E75C05D88B_at_rogers.com>
I will look at these as well. Incidently, my cbm-transfer for windows has a built in disassembler with selectable platforms for most cbm 8-bit machines plus a special “identifier” platform that can identify rom calls. It also has a hex viewer with compare function to spot differences, can enable masking bits to show screen codes and can be synchronized to the disassembler listing.

Steve


> On Sep 6, 2021, at 3:39 PM, Hans Liss <Hans_at_liss.pp.se> 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 23:03:22

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