WAI                       WAI Wait for Interrupt                      WAI

 65816 only!
                                                        N V M X D I Z C
  Operation:  Wait for interrupt. RDY held low until    . . . . . . . .
              Interrupt.

  +----------------+-----------------------+---------+---------+----------+
  | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
  +----------------+-----------------------+---------+---------+----------+
  | Implied        |   WAI                 |   $CB   |    1    |    3+    |
  +----------------+-----------------------+---------+---------+----------+