Allows interfacing from the NABU PC to the Raspberry Pi Pico via [ENID] (github.com/mackiea/ExternalNabuInterfaceDevice).
- 5 unused GPIO signals exposed
- Can be powered from the ENID 5V supply or from USB
| ENID | Pico GPIO Pin | Description |
|---|---|---|
| 1 | 27 | Interrupt Request |
| 2 | 26 | Interrupt Acknowledge |
| 3 | Not used | 3.58 MHz Clock |
| 4 | Not used | Audio |
| 5 | 22 | Card Select |
| 6 | 2 | Address 0 |
| 7 | 3 | Address 1 |
| 8 | 4 | Address 2 |
| 9 | 5 | Address 3 |
| 10 | Not used | 1.79 MHz Clock |
| 11 | 21 | Write |
| 12 | 20 | Read |
| 13 | 19 | I/O Request |
| 14 | 28 | Wait Request |
| 15 | Not Used | Reset |
| 16 | 6 | Data 0 |
| 17 | 7 | Data 1 |
| 18 | 8 | Data 2 |
| 19 | 9 | Data 3 |
| 20 | 10 | Data 4 |
| 21 | 11 | Data 5 |
| 22 | 12 | Data 6 |
| 23 | 13 | Data 7 |
| 24 | VSYS | +5V Rail 1 (Switched) |
| 25 | PCB Ground | Ground Rail 1 |