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+.\"	$OpenBSD: intro.4,v 1.1 2004/08/06 23:51:59 mickey Exp $
+.\"     $NetBSD: intro.4,v 1.8 2004/02/10 16:54:19 wiz Exp $
+.\"
+.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" 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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"        This product includes software developed by the NetBSD
+.\"        Foundation, Inc. and its contributors.
+.\" 4. Neither the name of The NetBSD Foundation nor the names of its
+.\"    contributors may be used to endorse or promote products derived
+.\"    from this software without specific prior written permission.
+.\"
+.\" 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 January 24, 2004
+.Dt INTRO 4 sgi
+.Os
+.Sh NAME
+.Nm intro
+.Nd introduction to special files and hardware support
+.Sh DESCRIPTION
+This section describes the special files, related driver functions,
+and networking support available in the system.
+In this part of the manual, the
+.Tn SYNOPSIS
+section of each configurable device gives a sample specification
+for use in constructing a system description for the
+.Xr config 8
+program.
+The
+.Tn DIAGNOSTICS
+section lists messages which may appear on the console
+and/or in the system error log
+.Pa /var/log/messages
+due to errors in device operation; see
+.Xr syslogd 8
+for more information.
+.Pp
+This section contains both devices which may be configured into
+the system and network related information.
+The networking support is introduced in
+.Xr netintro 4 .
+.Sh DEVICE SUPPORT
+This section describes the hardware supported by
+.Ox Os /sgi .
+Software support for these devices comes in two forms.
+A hardware device may be supported with a character or block
+.Em device driver ,
+or it may be used within the networking subsystem and have a
+.Em network interface driver .
+Block and character devices are accessed through files in the file
+system of a special type; see
+.Xr mknod 8 .
+Network interfaces are indirectly accessed through the interprocess
+communication facilities provided by the system; see
+.Xr socket 2 .
+.Pp
+A hardware device is identified to the system at configuration time
+and the appropriate device or network interface driver is then
+compiled into the system.
+When the resultant system is booted, the autoconfiguration facilities
+in the system probe for the device and, if found, enable the software
+support for it.
+If a device does not respond at autoconfiguration time it is not
+accessible at any time afterwards.
+To enable a device which did not autoconfigure, the system must be rebooted.
+.Pp
+The autoconfiguration system is described in
+.Xr autoconf 4 .
+A list of the supported devices is given below.
+.Sh HARDWARE
+The following systems are supported:
+.Pp
+.Bl -tag -width XXXXXXXXXX -offset indent -compact
+.It O2
+IP32
+.Pq Dq Moosehead
+.It Indy
+IP24
+.Pq Dq Guinness
+.It Indigo 2
+IP22
+.Pq Dq Fullhouse
+.It Indigo R4k
+IP20
+.Pq Dq Blackjack
+.It Indigo R3k
+IP12
+.Pq Dq Hollywood
+.El
+.Sh LIST OF DEVICES
+The devices listed below are supported in this incarnation of the
+system.
+Devices are indicated by their functional interface.
+Not all supported devices are listed.
+.Pp
+.Bl -tag -width macepci -offset indent -compact
+.It crime
+found on the O2
+.It dsclock
+real-time clock
+.It dpclock
+real-time clock
+.It gio
+PCI-like bus
+.It hpc
+High performance Peripheral Controller
+.It imc
+Indigo R4k/Indy/Indigo2 bus arbitrator
+.It mace
+found on the O2
+.\" .It macepci
+.It mec
+O2 MAC110 ethernet
+.It newport
+entry framebuffer on Indy and Indigo2
+.It pic
+Personal Iris 4D/3x and Indigo R3k bus arbitrator
+.It sbic
+WD33C93 SCSI interface
+.It sq
+SEEQ 8003/80C03 ethernet
+.It wdsc
+WD33C93 SCSI interface
+.El
+.Pp
+PCI devices are supported through the
+.Xr pci 4
+bus and associated device drivers.
+.Pp
+.\" .Sh UNSUPPORTED DEVICES
+.\" The following devices are not supported, due to unavailability of
+.\" either documentation or sample hardware:
+.\" .Pp
+.\" .Bl -tag -width XXXXX -offset indent -compact
+.\" .It not yet
+.\" .El
+.\" .Pp
+.Sh SEE ALSO
+.Xr autoconf 4 ,
+.Xr crime 4 ,
+.Xr gio 4 ,
+.Xr hpc 4 ,
+.Xr imc 4 ,
+.Xr mace 4 ,
+.Xr pic 4 ,
+.Xr config 8
+.Sh HISTORY
+This
+.Tn sgi
+.Nm
+appeared in
+.Ox 3.6 .