(Side B) Parts           Solder (Side A)
-----------------------------------------------------------
                        Gnd | 1 | 1 | Gnd
                   not used | 2 | 2 | Gnd
                   not used | 3 | 3 | Gnd
                   not used | 4 | 4 | Red
                      Green | 5 | 5 | Blue
                       Sync | 6 | 6 | Gnd (Video)
                      Spkr+ | 7 | 7 | Gnd (Spkr-)
                Coin Return | 8 | 8 | Coin*
             Service Return | 9 | 9 | Service*
                   P1 Start |10 |10 | not used
                   P2 Start |11 |11 | not used
                   P1 Right |12 |12 | not used
                    P1 Left |13 |13 | not used
                 P1 Missile |14 |14 | not used
                   P2 Right |15 |15 | not used
                    P2 Left |16 |16 | not used
                 P2 Missile |17 |17 | not used
                   not used |18 |18 | not used
                   not used |19 |19 | not used
          (Coin Meter) +12V |20 |20 | not used
                 Coin Meter |21 |21 | Gnd (Coin Meter)
                        +5V |22 |22 | +5V

+=2............