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+.\" $NetBSD: pnpbios.4,v 1.16 2021/03/12 10:48:29 nia Exp $
+.\"
+.\" Copyright (c) 1999-2002 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Lennart Augustsson.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd February 17, 2017
+.Dt PNPBIOS 4 i386
+.Os
+.Sh NAME
+.Nm pnpbios
+.Nd introduction to PnP BIOS support
+.Sh SYNOPSIS
+.Cd "pnpbios0 at mainbus?"
+.Cd "XX*      at pnpbios0 index ?"
+.Pp
+.Cd options PNPBIOSVERBOSE
+.Cd options PNPBIOSDEBUG
+.Sh INTRODUCTION
+.Nm
+provides support for finding and attaching devices by
+extracting information from the PnP BIOS of a machine.
+.Sh SUPPORTED DEVICES
+.Nx
+includes the following
+.Nm
+drivers, sorted by driver name:
+.Pp
+.Bl -tag -width x86/fdc(4) -offset indent -compact
+.It Xr com 4
+serial communications interface
+.It Xr ess 4
+ESS Technology AudioDrive family audio device driver
+.It Xr x86/fdc 4
+floppy controller
+.It Xr joy 4
+game controller
+.It Xr x86/lpt 4
+parallel port driver
+.It Xr pciide 4
+PCI IDE controllers driver
+.It Xr pckbc 4
+PC keyboard/mouse controller
+.It Xr sb 4
+SoundBlaster family audio device driver
+.It Xr wss 4
+Windows Sound System hardware driver
+.It Xr ym 4
+Yamaha OPL3-SA3 sound driver
+.El
+.Sh SEE ALSO
+.Xr i386/intro 4 ,
+.Xr isa 4 ,
+.Xr pci 4
+.Sh HISTORY
+The
+.Nm
+driver
+appeared in
+.Nx 1.5 .
+.Sh BUGS
+The
+.Nm
+bus provides a different way to attach devices than the real buses
+(e.g.,
+.Xr isa 4 ) .
+The reason to use
+.Nm
+instead of the real bus is that some machines have weird routings
+of, e.g., interrupts.
+The exact information about these things can
+be found in the BIOS, which is why the
+.Nm
+bus has a better chance of succeeding with getting it right.
+.Pp
+Many older BIOS implementations do not support PnP,
+and some newer ones do not follow the standards.