Section 4 manpages for the mac68k courtesy of Colin Wood

(ender@is.rice.edu).  Includes some tweaks by myself including a note of the
true HISTORY of the sn driver. :)

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+.\"	$OpenBSD: intro.4,v 1.1 1997/06/15 23:35:38 gene Exp $
+.\"	$NetBSD: intro.4,v 1.4 1997/03/28 00:29:35 veego Exp $
+.\"
+.\" Copyright (c) 1990, 1991 Regents of the University of California.
+.\" 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 University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+.\"
+.\"     from: @(#)intro.4	5.2 (Berkeley) 3/27/91
+.\"
+.Dd June 8, 1997
+.Dt INTRO 4 mac68k
+.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 MAC68K DEVICE SUPPORT
+This section describes the hardware supported on the
+.Tn Mac .
+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 will have to be rebooted.
+.Pp
+The autoconfiguration system is described in
+.Xr autoconf 4 .
+A list of the supported devices is given below.
+.Sh HISTORY
+The
+.Tn Mac68k
+.Nm intro
+man page first appeared in
+.Nx 
+1.2 .
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr autoconf 4 ,
+.Xr config 8 .
+.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.
+.Bl -tag -width "xxxxxx" -compact -offset indent
+.It Em adb
+Apple Desktop Bus event interface
+.It Em ae
+DP8390-based ethernet interface
+.It Em asc
+Apple Sound Chip 
+.It Em esp
+.Tn NCR
+53C9x built-in SCSI interface
+.It Em grf
+on-board and NuBus-based video interface
+.It Em kmem
+kernel virtual memory
+.It Em ite
+Mac68k Internal Terminal Emulator
+.It Em mem
+physical memory
+.It Em ncrscsi
+.Tn NCR
+5380 built-in SCSI interface
+.It Em sbc
+.Tn NCR
+5380 built-in SCSI interface
+.It Em sn
+DP83932-based ethernet interface (SONIC)
+.It Em zsc
+.Tn Zilog
+Z8530 built-in serial interface
+.El