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Pinouts for "Quantum" (Atari, 1983)

P20: 44-pin edge connector

        component side        solder side
        --------------        -----------
                   GND  A  1  GND
                   +5V  B  2  +5V
                        C  3  +22 VDC
                        D  4  -22 VDC
              10.3 VDC  E  5  V DIR 1 
             V CLOCK 1  F  6  H CLOCK 1
               H DIR 1  H  7 
             COIN LEFT  J  8 
               RED GND  K  9  COIN RIGHT
              COIN AUX  L 10  SELF TEST
               START 2  M 11  START 1
                P1 LED  N 12  AUDIO 2
             GREEN GND  P 13  AUDIO 1
              BLUE GND  R 14  P2 LED
             COUNTER R  S 15  COUNTER L 
               RED OUT  T 16  X GND
                 Y GND  U 17  BLUE OUT 
             GREEN OUT  V 18 
                        W 19  X OUT
                        X 20  Y OUT
                   +5V  Y 21  +SENSE (+5V)
                   GND  Z 22  -SENSE (GND)

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