* NOP zpg,X (opcodes D4, F4) are broken versions of CPY zpg,X and CPX zpg,X
* NOP abs,X (opcodes DC, FC) are broken versions of CPY abs,X and CPX abs,X
* NOP # (opcodes 80, 82, 89, C2, E2) are the useless instructions STY #, STX #, STA #* NOP # (opcodes C2, E2) are the useless instructions DEC #, INC #
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