50 pin D-SUB male connector at the
computer.
50 pin D-SUB female connector at the
cable.
| Pin | Return | Dir | Description | Active State |
|---|---|---|---|---|
| 22 | 6 | IN | Ready | High |
| 21 | 5 | IN | On Line | High |
| 23 | 7 | IN | Demand | High |
| 38 | 37 | OUT | Data Strobe | High |
| 19 | 3 | OUT | Data 1 | n/a |
| 20 | 4 | OUT | Data 2 | n/a |
| 1 | 2 | OUT | Data 3 | n/a |
| 41 | 40 | OUT | Data 4 | n/a |
| 34 | 18 | OUT | Data 5 | n/a |
| 43 | 42 | OUT | Data 6 | n/a |
| 36 | 35 | OUT | Data 7 | n/a |
| 28 | 44 | OUT | Data 8 | n/a |
| 29 | 13 | OUT | Parity | n/a |
| 50 | 32 | IN | Ident 0 | n/a |
| 49 | 16 | IN | Ident 1 | n/a |
| 46 | 45 | OUT | Interface Verify. Tied together. | Low? |
| 12 | 39 | OUT | +5 VDC (Test) | High |
| 27 | 11 | IN | Parity Error | High |
| 25 | 9 | IN | Bottom of Form | High |
| 24 | 8 | IN | Top of Form | High |
| 30 | 14 | OUT | Paper Instruction | High |
| 31 | 15 | OUT | Buffer Clear | High |
| 26 | 10 | IN | Paper Moving | High |
| 48 | 17 | IN | Paper Moving | High |
| 47 | 33 | IN | Not VFU | High |
Notes
- Direction is Host (Computer) relative Peripheral (Printer).
- Return is Ground signal for Unbalanced and the Negative Signal for Balanced.