NAME
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lpt – parallel port interface for PC's |
SYNOPSIS
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bind –a #L[123] /dev /dev/lpt[123]data /dev/lpt[123]dlr /dev/lpt[123]pcr /dev/lpt[123]psr |
DESCRIPTION
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The lpt driver provides an interface to the parallel interface
normally used for printers. The specifiers 1, 2, and 3 correspond
to the parallel interfaces at PC ports 0x3bc, 0x378, and 0x278
respectively. Lpt?data is write only. Writing to it sends data to the interface. This file is sufficient for communicating with most printers.
Lpt?dlr, lpt?pcr, and 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. |
SOURCE
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/sys/src/9/pc/devlpt.c |