82 lines
3.1 KiB
Groff
82 lines
3.1 KiB
Groff
.\"
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.\" Copyright (c) 1993 Christopher G. Demetriou
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.\" Copyright (c) 1994 Geoffrey M. Rehmet
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Christopher G. Demetriou.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software withough specific prior written permission
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" from: lpt.4,v 1.1 1993/08/06 10:34:12 cgd Exp
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.\" $Id: lpt.4,v 1.7 1998/10/15 20:27:26 wosch Exp $
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.\"
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.Dd August 28, 1993
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.Dt LPT 4 i386
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.Os FreeBSD
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.Sh NAME
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.Nm lpt
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.Nd
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Parallel port driver
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.Sh SYNOPSIS
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For interrupt-driven ports:
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.Cd "device lpt0 at isa? port" \&"IO_LPT1\&" tty irq 7
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.Cd "device lpt1 at isa? port" \&"IO_LPT2\&" tty irq 7
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.Cd "device lpt2 at isa? port" \&"IO_LPT3\&" tty irq 7
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.Pp
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For BIOS-probed ports:
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.Cd "device lpt0 at isa? port? tty irq 7"
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.Pp
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For polled ports:
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.Cd "device lpt0 at isa? port? tty"
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.Cd "device lpt1 at isa? port" \&"IO_LPT2\&" tty
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.Sh DESCRIPTION
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This driver provides access to parallel ports.
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.Pp
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The driver can be configured either to be either interrupt-driven, or
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to poll the printer. Ports that are configured to be
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interrupt-driven can be switched to polled mode by using the
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.Xr lptcontrol 8
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command.
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.Pp
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This driver replaces the functionality of the
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.Xr lpa 4
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driver, which is now defunct.
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.Sh FILES
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.Bl -tag -width Pa -compact
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.It Pa /dev/lpt0
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first parallel port driver
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.El
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.Sh SEE ALSO
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.Xr lp 4 ,
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.Xr lptcontrol 8
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.Sh BUGS
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There are lots of them, especially in cheap parallel port implementations.
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.Pp
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It is only possible to open a lpt port when a printer is connected and
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on-line, making it impossible to run
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.Xr lptcontrol 8
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when there is no printer connected.
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.Pp
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This driver could still stand a rewrite.
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