ref: 75c92428225428c8fde2d015f010e608a0b12f1d
dir: purgatorio/man/3/lpt
.TH LPT 3 .SH NAME lpt \- parallel port interface .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 0x378, 0x3bc, 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. The data is written as a hexadecimal (leading .BR 0x ), octal (leading .BR 0 ) or decimal number. Reads return a hexadecimal number representing the value of the register. .SH SOURCE .B /os/*/devlpt.c