COMMANDO
  CKT SIDE                    COMP SIDE
  --------                    ---------
  1  PL 1 DOWN                A  PL 2 DOWN
  2  PL 1 UP                  B  PL 2 UP
  3  PL 1 LEFT                C  PL 2 LEFT
  4  PL 1 RIGHT               D  PL 2 RIGHT
  5                           E
  6                           F
  7                           H
  8                           J
  9   PL 1 SHOOT 1            K  PL 2 SHOOT 1
  10  PL 1 SHOOT 2            L  PL 2 SHOOT 2
  11  1 START                 M  2 START
  12  COIN 1                  N  COIN 2
  13  CTR 1                   P  CTR 2
  14  VID BL                  R  VID GN
  15  SYNC                    S  VID RED
  16                          T
  17  SP+                     U  SP-
  18  +12V                    V       
  19  +5V                     W  +5V
  20  +5V                     X  +5V
  21  GND                     Y  GND
  22  GND                     Z  GND