INY                    INY Increment Index Y by one                   INY

  Operation:  X + 1 -> X                                N V - B D I Z C
                                                        / . . . . . / .

  +----------------+-----------------------+---------+---------+----------+
  | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
  +----------------+-----------------------+---------+---------+----------+
  |  Implied       |   INY                 |   $C8   |    1    |    2     |
  +----------------+-----------------------+---------+---------+----------+

What it does: Increases the Y Register by 1.

Major uses: Used exactly as DEY (see DEY), except it counts up instead of down. For loop indexing and working with the Indirect Y addressing mode (LDA (15),Y)