DEY DEY Decrement index Y by one DEY Operation: Y - 1 -> Y N Z C I D V / / . . . . (Ref: 7.7) +----------------+-----------------------+---------+---------+----------+ | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles| +----------------+-----------------------+---------+---------+----------+ | Implied | DEY | $88 | 1 | 2 | +----------------+-----------------------+---------+---------+----------+