DEX DEX Decrement index X by one DEX Operation: X - 1 -> X N Z C I D V / / . . . . (Ref: 7.6) +----------------+-----------------------+---------+---------+----------+ | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles| +----------------+-----------------------+---------+---------+----------+ | Implied | DEX | $CA | 1 | 2 | +----------------+-----------------------+---------+---------+----------+