SHS                                                                   SHS
                                                     N V - B D I Z C
  Operation:  X <- (A) /\ (X), S <- (X)              ? ? - - - - ? ?
              M <- (X) /\ (PCH+1)

  +----------------+-----------------------+---------+---------+----------+
  | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
  +----------------+-----------------------+---------+---------+----------+
  |  Absolute,Y    |   SHS $FFFF,Y         |   $9B   |    3    |    5*    |
  +----------------+-----------------------+---------+---------+----------+
  * Add 1 if page boundary is crossed.