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
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