APPENDIX C: Parallel-Port Pinouts
Table C-1. Parallel-Interface Specifications.
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Signal | Return |
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Pin | Pin | Signal | Pin | Direction | Description |
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1 | 19 | STROBE | 1 | IN | Strobe pulse to read |
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| data in. Pulse width |
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| must be more than |
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| 0.5 µsec. at the Card. |
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2 | 20 | DATA1 | 2 | IN | These signals |
3 | 21 | DATA2 | 3 | IN | represent infor- |
4 | 22 | DATA3 | 4 | IN | mation in bits |
5 | 23 | DATA4 | 5 | IN | parallel data. Each |
6 | 24 | DATA5 | 6 | IN | signal is HIGH when |
7 | 25 | DATA6 | 7 | IN | data is logical 1 and |
8 | 26 | DATA7 | 8 | IN | LOW when it is |
9 | 27 | DATA8 | 9 | IN | logical 0. |
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10 | 28 | ACKNLG | 10 | OUT | A LOW pulse of |
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| minimum width of |
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| 4 µsec. A LOW |
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| indicates that data |
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| has been received |
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| and that the printer |
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| is ready to accept |
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| more data. |
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11 | 29 | BUSY | 11 | OUT | A HIGH signal |
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| indicates that the |
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| printer cannot |
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| receive data. The |
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| signal goes HIGH |
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| when it is off line; or |
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| in the error state, |
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| when serving the |
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| IBM host and a byte |
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| of parallel data is |
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| received; or during |
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| data entry. |
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12 | 30 | PE | 12 | OUT | HIGH when printer |
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| is out of paper. |
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13 | — | SLCT | 13 | OUT | HIGH when the |
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| printer is ready. |
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