.\"	$OpenBSD: lpt.4,v 1.4 1999/09/23 04:12:05 alex Exp $
.\"
.\"
.\" Copyright (c) 1999 Michael Shalayeff
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.\"	This product includes software developed by Michael Shalayeff.
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.Dd April 14, 1999
.Dt LPT 4
.Os
.Sh NAME
.Nm lpt
.Nd Printer port controller
.Sh SYNOPSIS
.Cd "lpt0 at gsc? irq 7"
.Pp
.Cd "lpt0 at isa? port" \&"IO_LPT1\&" irq 7
.Pp
.Sh INTRODUCTION
Parallel port controller provides Centronics port for unidirectional
data communications
.Tn ( IEEE 1284 ) .
.Pp
The
.Nm
ports on
.Xr isa 4
comes in whole rainbow of flaivours.
The parallel port controller on
.Xr gsc 4
(core) bus comes in several chip implementations:
.Pp
.Bl -tag -compact -width WD16C552
.It WD16C552
contains both serial ports and a parallel port;
.It LASI
incorporated into the
.Xr lasi 4
megacell hyperchip.
.El
.Pp
In either case the bus interface is the same and compatible with
PC parallel ports.
.Sh SEE ALSO
.Xr com 4 ,
.Xr gsc 4 ,
.Xr isa 4 ,
.Xr lasi 4
.Sh HISTORY
The
.Nm
driver was originally developed by William F. Jolitz, TeleMuse.
The implementation for hppa port is using MI implementation of this
driver and first appeared in
.Ox 2.4 .