1.\" $OpenBSD: lpt.4,v 1.8 2017/07/07 09:15:59 fcambus Exp $ 2.\" 3.\" Copyright (c) 1993 Christopher G. Demetriou 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by Christopher G. Demetriou. 17.\" 3. The name of the author may not be used to endorse or promote products 18.\" derived from this software without specific prior written permission 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30.\" 31.Dd $Mdocdate: July 7 2017 $ 32.Dt LPT 4 33.Os 34.Sh NAME 35.Nm lpt 36.Nd parallel port driver 37.Sh SYNOPSIS 38.Cd "# alpha" 39.Cd "lpt* at isa? port 0x3bc irq 7" 40.Pp 41.Cd "# amd64" 42.Cd "lpt0 at isa? port 0x378 irq 7" 43.Cd "lpt* at puc?" 44.Pp 45.Cd "# i386" 46.Cd "lpt0 at isa? port 0x378 irq 7" 47.Cd "lpt1 at isa? port 0x278" 48.Cd "lpt2 at isa? port 0x3bc" 49.Cd "lpt* at puc?" 50.Pp 51.Cd "# hppa" 52.Cd "lpt0 at gsc? irq 7" 53.Cd "lpt0 at ssio?" 54.Pp 55.Cd "# sparc64" 56.Cd "lpt* at apio?" 57.Cd "lpt* at ebus?" 58.Sh DESCRIPTION 59This driver provides access to parallel ports. 60.Pp 61The highest bit in the minor (bit 7, or add 128) number selects 62whether to do polling or wait for interrupts. 63If no IRQ is specified in the kernel configuration, or the IRQ specified is 64not available at attach time, only the polling device may be used. 65.Pp 66The next lower bit (bit 6, or add 64) indicates the driver should 67avoid initializing the printer. 68.Pp 69The next lower bit (bit 5, or add 32) requests that the driver do 70automatic LF generation when printing CRs. 71.Sh FILES 72.Bl -tag -width /dev/lpt0 -compact 73.It Pa /dev/lpt0 74first interrupt-driven parallel port device 75.It Pa /dev/lpa0 76first polled parallel port device 77.El 78.Sh SEE ALSO 79.Xr intro 4 , 80.Xr isa 4 , 81.Xr ulpt 4 82