C16 not displaying numbers, strings correctly
davervw opened this issue · comments
Probably a 6502 emulation problem. Note the bytes free displayed wrong
Do I need to support illegal opcodes? Check out this walk of the ROM
C:\src\simple-emu-c64\bin\Debug>simple-emu-c64.exe c16 walk | find "?"
E32C 53 ???
E9F0 44 ???
8CF8 52 ???
8677 44 ???
86F7 52 ???
80CC 93 ???
VICE monitor shows some illegal opcodes here too. See top and bottom of this listing.
It appears there is a problem detecting system RAM, probably related to RAM/ROM selection at FF3E, FF3F not implemented. The undocumented opcodes is probably a different or non-issue.
Resolved, fixed C16 by implementing RAM wrap-around, other compatibility fixes.