What is Nostr?
paulrickards /
npub1kzs…q050
2023-09-25 22:04:11
in reply to nevent1q…ltjy

paulrickards on Nostr: Deep diving into buss error handling by reviewing the previous posts and the Lisa ...

Deep diving into buss error handling by reviewing the previous posts and the Lisa Boot ROM assembly.

http://bitsavers.org/pdf/apple/lisa/firmware/Lisa_Boot_ROM_Asm_Listing.TEXT

If I understand this correctly, memory $282 should hold the address that caused the bus error. In my case, I get

282 0002 0000

which I think is $020000 (high byte is ignored). Does that mean the problem is occurring at position 128kbytes in the RAM card? Not sure how to map that to a component/components yet.

#AppleLisaClone #RetroComputing
Author Public Key
npub1kzs35cf9c5gj88xh5rc74rzwag262ac8mlweaat7ylxz9ar2afmsugq050