SPRINT 1
Atari (1978):

44-pin edge connector
----------------------------------------------------
     VIDEO GND      | 1  | A  |    GND
     16.5v CT       | 2  | B  |    16.5v CT
     16.5v AC       | 3  | C  |    16.5v AC
     16.5v AC       | 4  | D  |    16.5v AC
     +10v UNREG     | 5  | E  |    +5v UNREG
     VIDEO          | 6  | F  |    STEERING 1A
     STEERING 1B    | 7  | H  |    COIN 2 N.O
     N/C            | 8  | J  |    COIN 1 N.O
     N/C            | 9  | K  |    PLAYER START LED
     SWITCH GND     | 10 | L  |    GAS PEDAL
     3rd GEAR       | 11 | M  |    2nd GEAR
     1st GEAR       | 12 | N  |    TEST
     START          | 13 | P  |    N/C
     N/C            | 14 | R  |    N/C
     N/C            | 15 | S  |    COIN COUNTER
     N/C            | 16 | T  |    N/C
     N/C            | 17 | U  |    N/C
     N/C            | 18 | V  |    N/C
     25v AC         | 19 | W  |    25v AC
     25v AC         | 20 | X  |    25v AC
     AUDIO          | 21 | Y  |    N/C
     25v CT         | 22 | Z  |    AUDIO GND