Odd code. It seems to have some magic I/O at $8000/$8001, with $8001 maybe producing side effects on read. Also, the sequence starting at $e7a0 is kinda epic. It laboriously stores code, instruction by instruction, at $0400 - $041b, and then jumps to $0400. I wonder why. /Hans On 2020-08-27 13:17, didier_at_aida.org wrote: > 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. >> >> >> >> >>Received on 2020-08-27 14:02:52
Archive generated by hypermail 2.3.0.