Parallel interface pin assignment table
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| 1 |
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| Input | Strobe signal for reading | ||
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| STROBE |
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| 2−9 |
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| 10 |
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| Output | |||
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| ACKNLG |
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| 11 |
| BUSY | Output | Signal specifying printer busy | ||||||
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| 12 |
| PERROR | Output | Signal specifying paper absence | ||||||
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| 13 |
| SELECT | Output | Signal specifying printer "on line" | ||||||
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| (printing) or "off line" (pause) |
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| 14 |
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| Input | Invalidness (ignorance) | |||
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| AUTOFD |
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T | 15 |
| NC | − | No use | ||||||
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| 16 |
| S.GND | − | Signal ground | ||||||
| 17 |
| FGND | − | Frame ground | ||||||
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| 18 |
| P.L.H | Output | Signal specifying peripheral logic high | ||||||
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| (pull up to +5V with 2 KΩ] |
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| 19−30 |
| GND | − | Ground for twisted pair return | ||||||
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| 31 |
| INIT | Input | Printer reset | ||||||
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| 32 |
| FAULT | Output | Signal specifying printer error | ||||||
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| 33−35 |
| NC | − | No use | ||||||
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| 36 |
| SELECTIN | Input | Invalidness (ignorance) | ||||||
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