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 14:01:09
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