ISB                    ISB INC memory, SBC memory                     ISB

                                                        N V - B D I Z C
  Operation:  M <- (M) + 1, A <- (A) - M - ~C           / / . . . . / /

  +----------------+-----------------------+---------+---------+----------+
  | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
  +----------------+-----------------------+---------+---------+----------+
  |  ZeroPage      |   ISB $FF             |   $E7   |    2    |    5     |
  |  ZeroPage,X    |   ISB $FF,X           |   $F7   |    2    |    6     |
  |  Absolute      |   ISB $FFFF           |   $EF   |    3    |    6     |
  |  Absolute,X    |   ISB $FFFF,X         |   $FF   |    3    |    7     |
  |  Absolute,Y    |   ISB $FFFF,Y         |   $FB   |    3    |    7     |
  |  (Indirect,X)  |   ISB ($FF,X)         |   $E3   |    2    |    8     |
  |  (Indirect),Y  |   ISB ($FF),Y         |   $F3   |    2    |    8     |
  +----------------+-----------------------+---------+---------+----------+

  Also known as ISC.