Hello, > The bytes at $e000 & $e001 are used as data, but also the irq/brk > vector points to $e000 so any irq or brk will go into an infinite > loop. No, $e000 ist only used as defaut value for $0059 and $e001 as defaut value for $006a. All hardware vectors (reset, irq and nmi) points to $e002. > Reset or nmi will start execution at $e002. There is a brk at $e864 that is called as error after timeout. So the reset routine is called via irq routine. I think this is an eprom for a single mpu system with small address decoding: $0000-$3fff for ram, $4000-$7fff for io1, $8000-$bf00 for io2 and $c000-$ffff for rom. Only first four bytes are used for io1 and io2. >> 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] > > Are the two roms related? It might help to have them both Yes, that's a very good idea. Is it possible to post the other rom, too? Regards MartinReceived on 2020-08-27 19:01:34
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