GND                 | A | 1 |      Ground
        + 5 V               | B | 2 |      + 5 V
        + 12 V              | C | 3 |      + 22 V DC
        - 5 V               | D | 4 |      - 22 V DC
                            | E | 5 |      Center Coin Counter
        Left Coin Counter   | F | 6 |      Right Coin Counter
                            | H | 7 |
        Start 1 LED         | J | 8 |
                            | K | 9 |      Fire Button 2
        Start 2             | L | 10|      Fire Button
        Start 1             | M | 11|      Tball Horiz Clock 2
        Tball Horiz. Clock  | N | 12|      Tball Vert. Clock 2
        Tball Vert. Clock   | P | 13|      Self Test *
        Left Coin Slot      | R | 14|      Right Coin Slot *
        Start 2 LED         | S | 15|      Cocktail (Tie to GND)
        Center Coin Slot    | T | 16|      Horiz. Dir. 2
        Tball Horiz. Dir.   | U | 17|      Vert. Dir. 2
        Reset (N. C.)       | V | 18|      Tball Vert. Dir.
                            | W | 19|
        Ground (Coin Door)  | X | 20|
        + 5 V (Controls)    | Y | 21|      + Sense
                            | Z | 22|      - Sense