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Parallel conector
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IBM-PC Parallel Printer Port Female DB-25 Socket external Pin layout
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\  13  12  11  10   9   8   7   6   5   4   3   2   1  /
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  \  25  24  23  22  21  20  19  18  17  16  15  14  /
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| pin  port  description       data direction 
|  1   C0   Strobe             PC Output
|  2   D0   Data 0             PC Output
|  3   D1   Data 1             PC Output
|  4   D2   Data 2             PC Output
|  5   D3   Data 3             PC Output
|  6   D4   Data 4             PC Output
|  7   D5   Data 5             PC Output
|  8   D6   Data 6             PC Output
|  9   D7   Data 7             PC Output
| 10   S6   ACK                PC Input
| 11   S7   Busy               PC Input
| 12   S5   Paper Empty        PC Input
| 13   S4   Select             PC Input
| 14   C1   Auto Feed          PC Output
| 15   S3   Error              PC Input
| 16   C2   Initalise printer  PC Output
| 17   C3   Select input       PC Output
| 18 - 25 ground
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| C = Control port (27Ah/37Ah)
| D = Data port    (278h/378h)
| S = Status port  (279h/379h)
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