SBX SBX X-Register AND with accu, SBC memory, result into X-Register  SBX
                                                     N V - B D I Z C
  Operation:  X <- (X)/\(A) - M                      ? ? - - - - ? ?

  +----------------+-----------------------+---------+---------+----------+
  | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
  +----------------+-----------------------+---------+---------+----------+
  |  Immediate     |   SBX #$FF            |   $CB   |    2    |    2     |
  +----------------+-----------------------+---------+---------+----------+