50 pin M/50 male connector at the
computer.
50 pin M/50 female connector at the
cable.
| Pin | Return | Dir | Description | Active State |
|---|---|---|---|---|
| CC | EE | IN | Ready | High |
| Y | AA | IN | On Line | High |
| E | C | IN | Demand | High |
| j | m | OUT | Data Strobe | High |
| B | D | OUT | Data 1 | n/a |
| F | J | OUT | Data 2 | n/a |
| L | N | OUT | Data 3 | n/a |
| R | T | OUT | Data 4 | n/a |
| V | X | OUT | Data 5 | n/a |
| Z | b | OUT | Data 6 | n/a |
| n | k | OUT | Data 7 | n/a |
| u | w | OUT | Data 8 | n/a |
| z | BB | OUT | Parity | n/a |
| d | f | IN | Ident 0 | n/a |
| a | c | IN | Ident 1 | n/a |
| v | x | OUT | Interface Verify | Low |
| HH | K | OUT | +5 VDC (Test) | High |
| r | t | IN | Parity Error | High |
| M | P | IN | Bottom of Form | High |
| S | U | IN | Top of Form | High |
| p | s | OUT | Paper Instruction | High |
| A | H | OUT | Buffer Clear | High |
| W | Y | IN | Paper Moving | High |
| FF | DD | IN | Paper Moving | High |
| e | h | IN | Not VFU | High |
Notes
- Direction is Host (Computer) relative Peripheral (Printer).
- Return is Ground signal for Unbalanced and the Negative Signal for Balanced.