Operation Code
From SnesLab
An Operation Code in the 65x architecture is the first byte of an instruction.
The first machine cycle of each instruction is the opcode fetch, during which both VPA=1 and VDA=1.
An Operation Code in the 65x architecture is the first byte of an instruction.
The first machine cycle of each instruction is the opcode fetch, during which both VPA=1 and VDA=1.