Wiring List for P20:
                                |
--------------------------------|-----------------------------------
        +5V RETURN          | A | 1 |      +5V RETURN
----------------------------|---|---|-------------------------------
        +5V REG             | B | 2 |      +5V REG
----------------------------|---|---|-------------------------------
        +10.3V              | C | 3 |      
----------------------------|---|---|-------------------------------
                            | D | 4 |    
----------------------------|---|---|-------------------------------
                            | E | 5 |     
----------------------------|---|---|-------------------------------
                            | F | 6 |     
----------------------------|---|---|-------------------------------
                            | H | 7 |
----------------------------|---|---|-------------------------------
        COIN COUNTER L      | J | 8 |      COIN COUNTER R
----------------------------|---|---|-------------------------------
                            | K | 9 |      TRAK-BALL LIGHT
----------------------------|---|---|-------------------------------
                            | L | 10|      
----------------------------|---|---|-------------------------------
                            | M | 11|     
----------------------------|---|---|-------------------------------
                            | N | 12|     
----------------------------|---|---|-------------------------------
                            | P | 13|      
----------------------------|---|---|-------------------------------
                            | R | 14|      
----------------------------|---|---|-------------------------------
        RED                 | S | 15|      BLUE
----------------------------|---|---|-------------------------------
        VIDEO RETURN        | T | 16|      GREEN
----------------------------|---|---|-------------------------------
        V SYNC              | U | 17|      COMPOSITE SYNC
----------------------------|---|---|-------------------------------
        AUDIO 1             | V | 18|      H SYNC
----------------------------|---|---|-------------------------------
                            | W | 19|      AUDIO 2
----------------------------|---|---|-------------------------------
                            | X | 20|
----------------------------|---|---|-------------------------------
        +5V (CONTROLS)      | Y | 21|      + SENSE
----------------------------|---|---|-------------------------------
        GND                 | Z | 22|      - SENSE
--------------------------------------------------------------------

Note: AUDIO 1 may be on the W pin and not the V pin.  To my knowledge
it has not been verified which of these two pins is correct. 

Wiring List for P19:
                                |
--------------------------------|-----------------------------------
                            | A | 1 |      
----------------------------|---|---|-------------------------------
                            | B | 2 |      
----------------------------|---|---|-------------------------------
                            | C | 3 |
----------------------------|---|---|-------------------------------
                            | D | 4 |
----------------------------|---|---|-------------------------------
        H DIR               | E | 5 |      H CLK
----------------------------|---|---|-------------------------------
        V DIR               | F | 6 |      V CLK
----------------------------|---|---|-------------------------------
        START 1/JUMP        | H | 7 |      SELF TEST
----------------------------|---|---|-------------------------------
        COIN RIGHT          | J | 8 |      COIN AUX
----------------------------|---|---|-------------------------------
                            | K | 9 |      COIN LEFT
----------------------------|---|---|-------------------------------
        START 2/JUMP        | L | 10|      
----------------------------|---|---|-------------------------------
                            | M | 11|
--------------------------------------------------------------------
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