PEI            PEI Push Effective Indirect Address on Stack           PEI

 65816 only!
                                                        N V M X D I Z C
  Operation:  W -> Ws, S-2 ->S                          . . . . . . . .

  +----------------+-----------------------+---------+---------+----------+
  | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
  +----------------+-----------------------+---------+---------+----------+
  |(Indirect)/Stack|   PEI ($FF)           |   $D4   |    2    |     6    |
  +----------------+-----------------------+---------+---------+----------+
  Add one cycle if low byte of direct page is <>0.