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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  /
 \                                                    /
  \  25  24  23  22  21  20  19  18  17  16  15  14  /
   \________________________________________________/
   
|~| 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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