On the Commodore side we speculate that different versions of the CPU might not have the same illegal opcodes. This is because they are dependent upon the exact layout of the ROM, traces and in some cases length of the traces and process used.
Has anybody seen or done testing of the full set against the NES CPU, R6502, GTE6502, 6507 etc
Has anybody seen or done testing of the full set against the NES CPU, R6502, GTE6502, 6507 etc