SLO           SLO ASL memory, ORA accu, result into accu              SLO
                                                     N V - B D I Z C
  Operation:  A <- (M << 1) \/ A                     ? ? - - - - ? ?

  +----------------+-----------------------+---------+---------+----------+
  | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
  +----------------+-----------------------+---------+---------+----------+
  |  Zeropage      |   SLO $FF             |   $07   |    2    |    5     |
  |  Zeropage,X    |   SLO $FF,X           |   $17   |    2    |    6     |
  |  Absolute      |   SLO $FFFF           |   $0F   |    3    |    6     |
  |  Absolute,X    |   SLO $FFFF,X         |   $1F   |    3    |    7*    |
  |  Absolute,Y    |   SLO $FFFF,Y         |   $1B   |    3    |    7*    |
  |  (Indirect,X)  |   SLO ($FF,X)         |   $03   |    2    |    8     |
  |  (Indirect),Y  |   SLO ($FF),Y         |   $13   |    2    |    8*    |
  +----------------+-----------------------+---------+---------+----------+
  * Add 1 if page boundary is crossed.