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.TH LPT 3
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.SH NAME
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lpt \- parallel port interface for PC's
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.SH SYNOPSIS
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.nf
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.B bind -a #L[123] /dev
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.B /dev/lpt[123]data
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.B /dev/lpt[123]dlr
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.B /dev/lpt[123]pcr
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.B /dev/lpt[123]psr
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.fi
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.SH DESCRIPTION
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The
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.I lpt
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driver provides an interface to the parallel
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interface normally used for printers.
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The specifiers
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.BR 1 ,
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.BR 2 ,
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and
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.BR 3
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correspond to
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the parallel interfaces at PC ports 0x3bc, 0x378, and 0x278
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respectively.
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.PP
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.B Lpt?data
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is write only.
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Writing to it sends data to the interface.
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This file is sufficient for communicating with most printers.
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.PP
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.BR Lpt?dlr ,
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.BR lpt?pcr ,
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and
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.B lpt?psr
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are used for fine control of the parallel port.
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Reading or writing these files corresponds to
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reading and writing the data latch register,
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printer control register, and printer status
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register.
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These are used by programs to drive special devices.
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.SH SOURCE
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.B /sys/src/9/pc/devlpt.c