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Input Ports
| Port Number (hex) | Equate | Function |
|---|---|---|
| 8 | INTST | Intercept Status Feedback (collision detection) |
| E | VERAF | Vertical Address Feedback (light pen) |
| F | HORAF | Horizontal Address Feedback (light pen) |
| 10 | SW0 | Player 1 Control Handle |
| 11 | SW1 | Player 2 Control Handle |
| 12 | SW2 | Player 3 Control Handle |
| 13 | SW3 | Player 4 Control Handle |
| 14 | KEY0 | Keypad Column 0 (right) |
| 15 | KEY1 | Keypad Column 1 |
| 16 | KEY2 | Keypad Column 2 |
| 17 | KEY3 | Keypad Column 3 (left) |
| 1C | POT0 | Player 0 Pot |
| 1D | POT1 | Player 1 Pot |
| 1E | POT2 | Player 2 Pot |
| 1F | POT3 | Player 3 Pot |
[NM:107, 143, source listing 5]
