LAE            LAE Stack-Pointer AND with memory, TSX, TXA            LAE

                                                        N V - B D I Z C
  Operation:  S,X,A <- (S /\ M)                         / . . . . . / .

  +----------------+-----------------------+---------+---------+----------+
  | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
  +----------------+-----------------------+---------+---------+----------+
  |  Absolute,Y    |   LAE $FFFF,Y         |   $BB   |    3    |    4*    |
  +----------------+-----------------------+---------+---------+----------+
  * Add 1 if page boundary is crossed.

  Also known as LAS, LAR.

  Warning: This opcode is said to be unstable!