Hi I checked for vic20/c64 signature but nothing the NMI/IRQ/RESET are set to the same location $E002 I've not found any string or it's strangely encoded On 27/08/2020 13:09, groepaz_at_gmx.net wrote: > Am Donnerstag, 27. August 2020, 12:48:58 CEST schrieb didier_at_aida.org: >> 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 > start with posting the binaries perhaps? there are a bunch of people here that > could help with some educated guessing :) > > one thing to always consider is swapped data and/or address lines - which is > why it helps a lot to have schematics. if you don't, i'd first start looking > for strings, and make sure they all make sense. > > typical c64 or vic20 "kernal" rom should have the hardware vectors in the last > 6 bytes. typical cartridges have the "cbm80" (or cbmA0 or whatever) signature > in their first few bytes. > > -- > > http://hitmen.eu http://ar.pokefinder.org > http://vice-emu.sourceforge.net http://magicdisk.untergrund.net > > Life's tough, get a helmet. > > > > >
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