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+.\"	$NetBSD: intro.4,v 1.9 2017/02/17 22:24:46 christos Exp $
+.\"
+.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Marcus Comstedt.
+.\"
+.\" 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 INTRO 4 dreamcast
+.Os
+.Sh NAME
+.Nm intro
+.Nd introduction to dreamcast 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 1
+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 on the
+.Tn Dreamcast
+platform.
+Software support for these devices come 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 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
+Standard builtin devices:
+.Bl -tag -width gapspci -offset indent -compact
+.It g2bus
+.Dq Tn G2
+internal I/O bus
+.It gapspci
+.Tn PCI
+bridge used in expansion port peripherals
+.It gdrom
+Builtin GD-ROM optical disc drive
+.It pvr
+Framebuffer device using the builtin NEC PVR graphics subsystem
+.It aica
+Builtin AICA sound system
+.El
+.\"
+.Pp
+Controller port peripherals are supported though the
+.Xr dreamcast/maple 4
+bus and associated device drivers.
+.\"
+.Pp
+Network interfaces:
+.Bl -tag -width gapspci -offset indent -compact
+.It rtk
+Ethernet driver for the HIT-0400 Broadband Adapter
+.It mbe
+Ethernet driver for the HIT-0300 LAN Adapter
+.El
+.\"
+.Sh SEE ALSO
+.Xr config 1 ,
+.Xr autoconf 4 ,
+.Xr netintro 4
+.Sh HISTORY
+The
+.Nm
+man page appeared in
+.Nx 2.0 .
+.\"  LocalWords:  NetBSD its INCIDENTAL EXEMPLARY SERVICES INTERRUPTION