Hi I was not aware that the list was accepting zip files this is the content in a zip file On 27/08/2020 13:17, Hans Liss wrote: > If you can share it, send it as a zipped attachment to the list, and > more people can take a look! > > /Hans > > On 2020-08-27 13:14, didier_at_aida.org wrote: >> I know very little about this eprom >> it was given to be by commodore maintenance about 30 years ago >> according to the label it was supposed to work on a network board >> installed in a 8032 motherboard >> obviously it's not the case >> I'm thinking to a c64 cartridge in ultimax mode (booting in $E000) >> I'm trying to get a better disassembly and some clue to go further >> >> >> >> >> On 27/08/2020 12:56, Francesco Messineo wrote: >>> Hi, >>> just a suggestion: when you reverse engineer some unknown firmware, >>> you NEED also to have a complete schematic of the system before you >>> start. >>> So if you don't have a schematic, you need to first reverse engineer a >>> good schematic. >>> I tell you that from my own experience on reverse engineering these >>> kind of old and undocumented boards. >>> The code starts to make sense (and you can start making sense of it) >>> once you know where RAM/ROM and whatever else (I/O) is mapped. >>> >>> HTH >>> Frank IZ8DWF >>> >>> On Thu, Aug 27, 2020 at 12:49 PM <didier_at_aida.org> wrote: >>>> I'm trying to identify an eprom with an unknown content >>>> I was thinking it was the eprom booting the server (a commodore mother >>>> board without screen nor keyboard in an industrial box) >>>> (on the commodore we had a network composed of a server and up to 16 >>>> stations) >>>> I have 2 eproms labeled: pc-central-26-4.bin (8k) and >>>> boot-poste-3.bin (4) >>>> the boot-post-3.bin contains the good content... [the copyright is >>>> present] >>>> what I know on the pc-central-26-4.bin: >>>> - it's a 8k eprom, starts at $E000, the code starts at $E002 before >>>> there are 2 bytes $00 $BF >>>> - it's 6502 code (seems written by an amateur) >>>> - there is some code between $E800 and $E8FF so it's not a 8032 >>>> - they are writing something around $8000 and also around $0400 >>>> >>>> I was thinking that perhaps it was something for a vic20 or a c64 but >>>> I've not really used this 2 machines >>>> any idea of what I can do to identify the machine ? >>>> >>>> I'm thinking to try to check the use of I/O area but I need a better >>>> disassembly >>>> >>>> >> >
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