UNKNOWN CONNECTOR at the Atari. | Pin | Description | | 1 | Keypad -- right column | | 2 | Keypad -- middle column | | 3 | Keypad -- left column | | 4 | Start, Pause, and Reset common | | 5 | Keypad -- third row and Reset | | 6 | Keypad -- second row and Pause | | 7 | Keypad -- top row and Start | | 8 | Keypad -- bottom row | | 9 | Pot common | | 10 | Horizontal pot (POT0, 2, 4, 6) | | 11 | Vertical pot (POT1, 3, 5, 7) | | 12 | 5 volts DC | | 13 | Bottom side buttons (TRIG0, 1, 2, 3) | | 14 | Top side buttons | | 15 | 0 volts -- ground |
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