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Input Ports
| Port Number (hex) | Function |
|---|---|
| 8 | Intercept Feedback |
| E | Vertical Line Feedback |
| F | Horizontal Address Feedback |
| 10 | Player 1 Control Handle |
| 11 | Player 2 Control Handle |
| 12 | Player 3 Control Handle |
| 13 | Player 4 Control Handle |
| 14 | Keypad Column 0 (right) |
| 15 | Keypad Column 1 |
| 16 | Keypad Column 2 |
| 17 | Keypad Column 3 (left) |
[NM:107]
