TYX                  TYX Transfer Index Y to Index X                   TYX

 65816 only!
                                                        N V M X D I C Z
  Operation:  Y -> X                                    / . . . . . . /

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