DEY is an
opcode for the
6502 processor. It decreases the value in the Y
register by 1. If the register contains zero before this instruction is executed, its value will
wrap around so that it contains 255 (equivalent to -1 in 8-bit
2's complement arithmetic).
The N and Z flags may be affected by this instruction's execution.
The machine code representation of this opcode is 0x88.
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