MEGA ZONE                            
 CKT SIDE                                  PARTS SIDE
-----                                     -----
 A1  -5V                                   B1  +12V
 A2  SP                                    B2  SP
 A3  PL 2 SHOOT 1                          B3  PL 2 SHOOT 2
 A4  PL 2 LEFT                             B4  PL 2 RIGHT
 A5  1 PLAY START                          B5  2 PLAY START
 A6  PL 1 SHOOT 2                          B6  PL 2 UP
 A7  PL 1 SHOOT 1                          B7  SVC
 A8  PL 1 RIGHT                            B8  PL 1 LEFT
 A9  PL 1 UP                               B9  PL 2 DOWN
A10  COIN 1                               B10  COIN 2
A11  PL 1 DOWN                            B11  COIN CTR
A12                                       B12
A13  VID GN                               B13  VID BL
A14  VID RED                              B14  SYNC
A15                                       B15
A16  GND                                  B16  GND
A17  GND                                  B17  GND
A18  +5V                                  B18  +5V