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 >>> >>> >Received on 2020-08-27 14:01:26
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