Auxiliary I/O connector
>The auxiliary I/O connector is a 25-pin, D-SUB male connector.
| Pin | Signal |
| 1 | GND |
| 2 | LVTTL I/O 0 |
| 3 | LVTTL I/O 2 |
| 4 | LVTTL I/O 4 |
| 5 | LVTTL I/O 6 |
| 6 | LVTTL I/O 8 |
| 7 | GND |
| 8 | LVTTL I/O 10 |
| 9 | VTTL I/O 12 |
| 10 | LVTTL I/O 14 |
| 11 | LVTTL I/O 16 |
| 12 | LVTTL I/O 18 |
| 13 | GND |
| 14 | GND |
| 15 | LVTTL I/O 1 |
| 16 | LVTTL I/O 3 |
| 17 | LVTTL I/O 5 |
| 18 | LVTTL I/O 7 |
| 19 | LVTTL I/O 9 |
| 20 | GND |
| 21 | LVTTL I/O 11 |
| 22 | LVTTL I/O 13 |
| 23 | LVTTL I/O 15 |
| 24 | LVTTL I/O 17 |
| 25 | LVTTL I/O 19 |
