1 1 1 1
3 2 1 0 9 8 7 6 5 4 3 2 1
                                 
\                             /
\                         /
                         
2 2 2 2 2 2 1 1 1 1 1 1
5 4 3 2 1 0 9 8 7 6 5 4

Pin In/Out Signal Name    Pin In/Out Signal Name
                                                  
1   I/O   -STROBE         14   O    -AUTO FEED XT
2   I/O   Data Bit 0      15   I    -ERROR
3   I/O   Data Bit 1      16   O    -INIT
4   I/O   Data Bit 2      17   O    -SLCT IN
5   I/O   Data Bit 3      18   na   Ground
6   I/O   Data Bit 4      19   na   Ground
7   I/O   Data Bit 5      20   na   Ground
8   I/O   Data Bit 6      21   na   Ground
9   I/O   Data Bit 7      22   na   Ground
10   I     -ACK            23   na   Ground
11   I     BUSY            24   na   Ground
12   I     PE              25   na   Ground
13   I     SLCT

Notes:   The signals on pins 10, 11, 12, 13, and 15 are represented at
port n+1 (where n is the printer base port; e.g., at port 379H
on LPT1).  See Printer Ports.

  Original PC/XT/AT  Pins 1-9 can carry information in only one
direction -- from the PC to the printer.

  Bidirectional PS/2 On PS/2s and most printer adaptors built
after 1987, the circuits are designed to handle bidirectional
I/O.

A bidirectional parallel cable is used with the DOS InterLink
utility.  See InterLink Cables.

- -

Parallel Port Connector