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Posted By

Mad
on 2017-04-18
14:25:50
 Re: Majesty of Sprites II the lands of Zador

Yes! $FD00 onwards are "system registers". I would suspect the ram for this issue (with $f910 and so on). However I am also not into hardware electronics by myself.

edit: Perhaps it's worth checking for the corrupted bits at $f910. To do that type: poke63760,0 and then printpeek(63760). Notify the number shown on the screen and then do: poke63760,255 and then printpeek(63760). The two printed numbers are of interest. Perhaps you get different numbers and we can see which bits are corrupted. Perhaps you can do both steps then a second time and if the numbers are the same we can see which bits are permanently corrupt. I know it's somehow possible to map the corrupt bits to a defective ram unit. And perhaps the same procedure with 63761 (so we know from two memory locations which bits are corrupted).



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