      ARR                ARR Accu AND with memory, ROR accu                 ARR

                                                            N V - B D I Z C
      Operation:  A <- [(A /\ M) >> 1]                      / / . . . . / /

      +----------------+-----------------------+---------+---------+----------+
      | Addressing Mode| Assembly Language Form| OP CODE |No. Bytes|No. Cycles|
      +----------------+-----------------------+---------+---------+----------+
      |  Immediate     |   ARR #$FF            |   $6B   |    2    |    2     |
      +----------------+-----------------------+---------+---------+----------+

      Note: Part of this command are some ADC mechanisms. Following effects
      appear after AND but before ROR: the V-Flag is set according to
      [(A and #mem)+#mem], Bit 0 does NOT go into carry, but Bit 7 is
      exchanged with the carry.