Pinouts
Register DB-25 I/O
Signal Name Bit Pin Direction
=========== ======== ===== =========
-Strobe ¬C0 1 Output
+Data Bit 0 D0 2 Output
+Data Bit 1 D1 3 Output
+Data Bit 2 D2 4 Output
+Data Bit 3 D3 5 Output
+Data Bit 4 D4 6 Output
+Data Bit 5 D5 7 Output
+Data Bit 6 D6 8 Output
+Data Bit 7 D7 9 Output
-Acknowledge S6 10 Input
+Busy ¬S7 11 Input
+Paper End S5 12 Input
+Select In S4 13 Input
-Auto Feed ¬C1 14 Output
-Error S3 15 Input
-Initialize C2 16 Output
-Select ¬C3 17 Output
Ground - 18-25 -
(Note again that the S7, C0, C1 & C3 signals are inverted)
IBM-PC Parallel Printer Port Female DB-25 Socket external Pin layout
______________________________________________________ / \ \ 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 / \________________________________________________/So it's also the Pin layout on the solder side of the Male DB-25 Cable Connector that plugs into it