STY                    STY Store index Y in memory                    STY

  Operation: Y -> M                                     N V - B D I Z C
                                                        . . . . . . . .

  +----------------+-----------------------+---------+---------+----------+
  | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
  +----------------+-----------------------+---------+---------+----------+
  |  Zero Page     |   STY $FF             |   $84   |    2    |    3     |
  |  Zero Page,X   |   STY $FF,X           |   $94   |    2    |    4     |
  |  Absolute      |   STY $FFFF           |   $8C   |    3    |    4     |
  +----------------+-----------------------+---------+---------+----------+