RTS                    RTS Return from subroutine                     RTS
                                                        N Z C I D V
  Operation:  PC from Stack, PC + 1 -> PC               . . . . . .
                                 (Ref: 8.2)
  +----------------+-----------------------+---------+---------+----------+
  | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
  +----------------+-----------------------+---------+---------+----------+
  |  Implied       |   RTS                 |   $60   |    1    |    6     |
  +----------------+-----------------------+---------+---------+----------+
   See also: RTL