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+.\"
+.\" Copyright (c) 1996 Jonathan Stone.
+.\" 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 Jonathan Stone.
+.\" 4. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+.\"
+.\"	$NetBSD: intro.4,v 1.22 2017/07/28 16:11:03 wiz Exp $
+.\"
+.Dd July 28, 2017
+.Dt INTRO 4 pmax
+.Os
+.Sh NAME
+.Nm intro
+.Nd introduction to pmax 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 pmax
+(MIPS-based DECstation/DECsystem) platform.
+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 pmax/autoconf 4 .
+A list of the supported devices is given below.
+.Sh SEE ALSO
+.Xr config 1 ,
+.Xr pmax/autoconf 4
+.Sh SUPPORTED SYSTEMS
+The following systems are supported:
+.Pp
+.Bl -tag -width speaker -offset indent -compact
+.It DECstation 2100 and 3100
+also known as "PMIN" and "PMAX".
+The 2100 and 3100 differ only in CPU clock
+speed.
+.It DECsystem 5100
+also known as "MIPSMATE".
+.It DECstation 5000/200
+also known as "3MAX".
+The 5000/200 has a 25 MHz R3000 and is the first-generation TURBOchannel
+platform.
+.It DECstation 5000/1xx
+also known as "3MIN" or "kmin".
+The 5000/1xx comes in 20 MHz, 25 MHz, and 33 MHz versions and is
+numbered appropriately.
+Two 12.5 MHz
+TURBOchannel slots are provided.
+.It DECstation 5000/xx
+also known as "Personal DECstation" or "MAXINE".
+The 5000/xx comes in 20 MHz, 25 MHz, and 33 MHz variants.
+A baseboard 1024x786 framebuffer, and two 12.5 MHz TURBOchannel slots
+are provided.
+.It DECstation 5000/240 and DECsystem 5900
+also known as "3MAXPLUS".
+These systems have a 40 MHz R3400 CPU and three 25 MHz TURBOchannel slots.
+The 5900 is an expanded-cabinet version of the 5000/240.
+.El
+.Pp
+TURBOchannel systems (except the 5000/200) can be upgraded to an
+R4000 or R4400 CPU by upgrading the CPU daughterboard.
+.Pp
+The Qbus-based DECsystem 5400 and 5500 are not supported.
+.Pp
+The multi-processor XMI-bus DECsystem 5800 is not supported.
+.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 speaker -offset indent -compact
+.It asc
+NCR 53c94-based SCSI interface, either on DECstation 5000-series
+baseboard or PMAZ-AA SCSI option card.
+.It bba
+baseboard audio on 5000/xx systems.
+.It dz
+serial driver for DEC custom four-port serial device (dc7085 DZ-11 clone)
+on the baseboard of DECstation 2100/3100, 5100, and 5000/200 systems.
+.It zsc
+serial driver for Zilog SCC asynchronous/synchronous devices on the
+baseboard of DECstation 5000-series systems (excluding 5000/200).
+.It le
+Ethernet driver for baseboard or TURBOchannel option cards.
+.It ioasic
+Adaptor for the baseboard IO ASIC on second-generation TURBOchannel
+machines.
+An ioasic must be configured on a 5000/1xx, 5000/xx, and 5000/240
+if support for baseboard devices or the TURBOchannel bus is desired.
+.It wsdisplay
+Pseudo-device driver supporting glass-tty console emulation on DEC
+framebuffers, DEC mice, and LK-201 family keyboards.
+.It sii
+DEC custom SCSI adaptor on DECstation 2100, 3100, and 5100.
+.It pm
+DECstation 2100/3100 baseboard framebuffer
+.It tc
+Adaptor for the TURBOchannel I/O expansion bus.
+This must be included if any TURBOchannel option cards are supported,
+or for the baseboard Ethernet and SCSI devices on a 5000/200.
+.It cfb
+PMAG-B TURBOchannel 1024x876 unaccelerated 2-D framebuffer.
+.It sfb
+PMAGB-BA TURBOchannel 1280x1024 accelerated framebuffer.
+.It mfb
+PMAG-AA TURBOchannel 1280x1024 mono/greyscale unaccelerated framebuffer.
+.It tfb
+PMAG-JA and PMAG-RO TURBOchannel 1280x1024 unaccelerated framebuffer.
+.It px
+PMAG-C TURBOchannel 2-D accelerated graphics board.
+.It pxg
+PMAG-D, E and F TURBOchannel 2-D/3-D accelerated graphics boards.
+.El
+.Sh UNSUPPORTED DEVICES
+The following devices are not supported, due to unavailability of
+either documentation or sample hardware:
+.Pp
+.Bl -tag -width speaker -offset indent -compact
+.It LoFi
+DEC Western Research Labs audio card
+.El
+.Pp
+The floppy-disk drive on the MAXINE baseboard is currently not
+supported.
+.Sh HISTORY
+This
+.Tn pmax
+.Nm intro
+appeared in
+.Nx 1.2 .