Parallel Port Connector

                         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.

See Also: Cables and Pin Outs
          Parallel Ports
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