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