| Pin | Direction | Signal |
|---|---|---|
| 1 | Out | Data Strobe |
| 2 | Out | Data 0 |
| 3 | Out | Data 1 |
| 4 | Out | Data 2 |
| 5 | Out | Data 3 |
| 6 | Out | Data 4 |
| 7 | Out | Data 5 |
| 8 | Out | Data 6 |
| 9 | Out | Data 7 |
| 10 | In | Acknowledge |
| 11 | In | Busy |
| 12 | In | Paper Out |
| 13 | In | Select |
| 14 | Out | Auto feed |
| 15 | In | Error |
| 16 | Out | Init |
| 17 | Out | Select Input |
| 18-25 | Ground |