pmax man4 by Jonathan Stone from NetBSD with *lots* of typos and

spelling errors fixed.

11 files changed, 1042 insertions, 0 deletions

diff --git a/share/man/man4/man4.pmax/Makefile b/share/man/man4/man4.pmax/Makefile
new file mode 100644
index 00000000000..810f85b3b5b
--- /dev/null
+++ b/share/man/man4/man4.pmax/Makefile
@@ -0,0 +1,6 @@
+#	$OpenBSD: Makefile,v 1.1 1998/03/09 15:35:50 millert Exp $
+
+MAN=	 intro.4 asc.4 le.4 ioasic.4 dc.4 lk201.4 scc.4 sii.4 tc.4
+MANSUBDIR=/pmax
+
+.include <bsd.prog.mk>
diff --git a/share/man/man4/man4.pmax/asc.4 b/share/man/man4/man4.pmax/asc.4
new file mode 100644
index 00000000000..0a778eae6fa
--- /dev/null
+++ b/share/man/man4/man4.pmax/asc.4
@@ -0,0 +1,89 @@
+.\"
+.\" 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.
+.\" 3. 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: asc.4,v 1.2 1997/10/13 11:23:41 lukem Exp $
+.\"	$OpenBSD: asc.4,v 1.1 1998/03/09 15:35:50 millert Exp $
+.\"
+.Dd August 6, 1996
+.Dt ASC 4 pmax
+.Os NetBSD 1.2
+.Sh NAME
+.Nm asc
+.Nd
+TurboChannel SCSI adaptor
+.Sh SYNOPSIS
+.Cd "asc? at ioasic?"
+.Cd "asc? at tc?"
+.Cd "oldscsibus* at asc?"
+.Cd "scsibus* at asc?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the NCR 53c94-based scsi host adaptor
+adaptor on the DECstation 5000 series, and for the PMAZ-AA and related
+TurboChannel SCSI-adaptor option boards.
+The
+.Nm
+is a medium-performance implementation of the SCSI-I common set
+supporting synchronous and asynchronous SCSI devices.  The driver
+provides no support for targets with multiple logical unit numbers
+(LUNs).
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr rz 4 ,
+.Xr tz 4 ,
+.Xr sd 4 ,
+.Xr st 4 ,
+.Xr cd 4 ,
+.Xr ch 4 .
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Bx 4.4 .
+.Sh BUGS
+The
+.Nm
+driver only supports the
+.Nm oldscsibus
+higher-level layer, and the
+.Nm rz
+and
+.Nm tz
+devices, which first appeared in 
+.Bx 4.4 /pmax.
+It should be  re-written to support the
+.Nm scsibus
+machine-independent higher-level SCSI layer and the
+.Nm sd ,
+.Nm st ,
+and
+.Nm cd
+drivers. This is
+.Ud .
diff --git a/share/man/man4/man4.pmax/dc.4 b/share/man/man4/man4.pmax/dc.4
new file mode 100644
index 00000000000..faadf0eefc2
--- /dev/null
+++ b/share/man/man4/man4.pmax/dc.4
@@ -0,0 +1,117 @@
+.\"
+.\" 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.
+.\" 3. 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: dc.4,v 1.3 1998/02/23 19:46:24 jonathan Exp $
+.\"	$OpenBSD: dc.4,v 1.1 1998/03/09 15:35:50 millert Exp $
+.\"
+.Dd February 20, 1998
+.Dt DC 4 pmax
+.Os NetBSD
+.Sh NAME
+.Nm dc
+.Nd
+dc659, dc7085 DZ11-on-a-chip serial communications interface 
+.Sh SYNOPSIS
+.Cd "dc0 at ioasic?"
+.Cd "dc0 at mainbus"
+.Cd "dc1 at mainbus"
+.Cd "dc2 at mainbus"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for Digital's dc7085 four-port serial
+communications chip.
+The
+.Nm dc
+driver supports dc7085 hardware on attached to the following
+parent devices:
+.Pp
+.Bl -tag -width speaker -offset indent -compact
+.It mainbus
+baseboard device on DECstation 2100, 3100, and 5100,
+and optional expansion devices on the 5100.
+.It ioasic
+baseboard device on DECstation 5000/200.
+.It vsbus
+baseboard devices on the VAXstation 2000 and 3100.
+.El
+.Pp
+The
+.Nm
+device is in essence a single-chip clone of the DZ-11.
+The DZ-11 hardware design severely constrains performance.
+One small input silo is shared across all input ports.
+The 
+.Nm dc
+hardware does not interrupt on modem transitions; instead,
+they are detected via polling.
+Only two lines on a baseboard 
+.Nm dc
+device  have any modem control signals;
+the other two lines are wired for a keyboard and mouse.
+
+On some implementations (e.g., DECstation 3100), the hardware does not
+bring out modem flow-control signals to the bulkhead. Only modem
+carrier transition are provided. This is adequate for Unix dialin
+and dialout detection, but without hardware flow control, the
+.Nm
+device is prone to overruns when used for serial-line protocols.
+
+The DECstation 5000/200 
+.Nm
+hardware provides full modem control on 
+both bulkhead RS-232 ports and is less prone to overrun.
+.Sh BUGS
+.Pp
+The 19200 speed on all
+.Nm
+devices is actually implemented as 19800,
+presumably for bug-compatibility with the original DZ-11.
+This is a hardware feature and cannot be corrected in software.
+Many serial devices at 19200 fail to interoperate with the
+.Nm
+at its 19800 speed setting.
+.Pp
+The DECstation 5000/200 can set a bit in the system register
+to allow the
+.Nm 
+to run at 38400, but this applies to all four lines and disables
+the 19200 speed on all four lines. This feature is not currently supported.
+.Pp
+The 
+.Nm
+driver should be merged into a single driver supporting the original
+DZ-11, DZ-32, and Qbus DZV-11 and DZQ-11 clones.
+.Sh HISTORY
+The
+.Nm
+driver
+first appeared in
+.Bx 4.4 /pmax. This manual page first appeared in 
+.Nx 1.2 .
diff --git a/share/man/man4/man4.pmax/intro.4 b/share/man/man4/man4.pmax/intro.4
new file mode 100644
index 00000000000..28d26d735ae
--- /dev/null
+++ b/share/man/man4/man4.pmax/intro.4
@@ -0,0 +1,186 @@
+.\"
+.\" 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.
+.\" 3. 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 1.2 1997/10/13 11:23:47 lukem Exp $
+.\"	$OpenBSD: intro.4,v 1.1 1998/03/09 15:35:50 millert Exp $
+.\"
+.Dd
+.Dt INTRO 4 pmax
+.Os NetBSD 1.2
+.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 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 autoconf 4 .
+A list of the supported devices is given below.
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr autoconf 4 ,
+.Xr config 8 .
+.Sh SUPPORTED SYSTEMS
+The following systems are supported:
+.Bl -tag -width speaker -offset indent -compact
+.It DECstation 2100 and 3100
+also known as "pmax". The 2100 and 3100 differ only in CPU clock speed.
+.It DECstation 5000/200
+also known as "3MAX".  The 5000/200 has a 25MHz r3000 and is the
+first-generation TurboChannel platform.
+.It DECstation 5000/1xx
+also known as "3MIN" or "kmin".  The 5000/1xx comes in 20MHz, 25Mhz,
+and 33MHz versions and is numbered appropriately.
+Two 12.5MHz
+TurboChannel slots are provided.
+.It DECstation 5000/2x
+also known as "Personal DECstation" or "MAXINE". The 5000/xx comes in
+20MHz  and 25Mhz variants. A baseboard 1024x786 framebuffer
+Two 12.5MHz TurboChannel slots and  are provided.
+.It DECstation 5000/240 and DECsystem 5900
+aslso known as "3MAXPLUS". These systems have a 40MHz r3400
+CPU and three 25MHz 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. These systems (5000/150, 5000/50,
+and 5000/260) are not supported.
+The DECstation 5100 and the Qbus-based DECsystem 5400 and 5500 are not supported.
+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 dc
+serial driver for DEC custom four-port serial device (dc7085 DZ-11 clone)
+on the baseboard of DECstation 2100/31000, 5100, and 5000/200 systems.
+.It scc
+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 TC bus is desired.
+.It fb
+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, 5100, and VAXstation 3100.
+.It rz
+SCSI disk driver, based on the 4.4bsd/pmax scsi disk driver.
+.It tz
+SCSI tape driver, based on the 4.4bsd/pmax scsi disk driver.
+.It pm
+DECstation 2100/3100 baseboard framebuffer
+.It tc
+Adaptor for the TurboChannel I/O expansion bus.
+tc support must be included if any TC 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 unaccelerated framebuffer.
+.It mfb
+PMAG-AA TurboChannel 1280x1024 mono/greyscale unaccelerated framebuffer.
+.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 PMAG-C	accelerated 2-D framebuffer card
+.It PMAG-D	accelerated 2-D framebuffer card
+.It PMAG-E	accelerated 2-D framebuffer card
+.It PMAG-F	accelerated 2-D framebuffer card
+.It LoFi	DEC Western Research Labs audio card
+.El
+The floppy-disk drive and sound hardware on the MAXINE baseboard
+are currently not supported.
+.Sh HISTORY
+This
+.Tn pmax
+.Nm intro
+appeared with
+.Nx 1.2 .
diff --git a/share/man/man4/man4.pmax/ioasic.4 b/share/man/man4/man4.pmax/ioasic.4
new file mode 100644
index 00000000000..7cfd3b16036
--- /dev/null
+++ b/share/man/man4/man4.pmax/ioasic.4
@@ -0,0 +1,104 @@
+.\"
+.\" Copyright (c) 1996, 1997 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.
+.\" 3. 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: ioasic.4,v 1.4 1997/10/31 02:26:09 jonathan Exp $
+.\"	$OpenBSD: ioasic.4,v 1.1 1998/03/09 15:35:51 millert Exp $
+.\"
+.Dd August 6, 1996
+.Dt IOASIC 4 pmax
+.Os NetBSD 1.2
+.Sh NAME
+.Nm ioasic
+.Nd
+baseboard IO control ASIC for DEC TurboChannel systems
+.Sh SYNOPSIS
+.Cd "ioasic0 at tc?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the DEC proprietary IOCTL asic found on
+all DEC TurboChannel machines with MIPS (DECstation 5000 series,
+excluding the 5000/200) and Alpha (3000-series) processors.  On these
+machines (including the 5000/200), all baseboard devices should be
+configured as children of the
+.Nm "" .
+The
+.Nm
+provides hardware DMA channels and interrupt support for
+several baseboard devices, including one
+.Nm asc
+scsi device with a scatter/gather DMA channel, an mc146818-compatible
+.Nm mcclock,
+one or two
+.Nm scc
+two-port serial devices, and a am9770 LANCE
+.Nm le
+Ethernet interface.
+.Pp
+The
+.Nm
+is also used for those 
+floppy-disc drive and audio/ISDN hardware
+on the Personal DECstation and audio-equipted TC Alphas, where the 
+.Nm
+hardware provides a
+a
+scatter-gather DMA channel between he 16-bit device and the 32-bit
+.Nm tc
+DMA address space.
+.Pp
+Support for scatter-gather DMA eliminates the need for additional copying.
+A baseboard
+.Nm asc
+SCSI adaptor attached to an
+.Nm ioasic 
+will give slightly better performance than its
+.Nm tc
+counterpart.
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr mcclock 4 ,
+.Xr asc 4 ,
+.Xr le 4 ,
+.Xr scc 4 ,
+.Xr tc 4 .
+.Sh HISTORY
+The
+.Nm
+driver
+first appeared in
+.Nx 1.1 ,
+derived from DECstation boot-time configuration code in
+.Bx 4.4  .
+.Sh BUGS
+The DECstation 5000/200 does not actually have an
+.Nm ioasic
+chip, but for consistency it must be configured as if it
+did.
+
diff --git a/share/man/man4/man4.pmax/le.4 b/share/man/man4/man4.pmax/le.4
new file mode 100644
index 00000000000..16f4f0f6684
--- /dev/null
+++ b/share/man/man4/man4.pmax/le.4
@@ -0,0 +1,112 @@
+.\"
+.\" Copyright (c) 1996, 1997 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.
+.\" 3. 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: le.4,v 1.2 1997/10/31 02:53:46 jonathan Exp $
+.\"	$OpenBSD: le.4,v 1.1 1998/03/09 15:35:51 millert Exp $
+.\"
+.Dd August 6, 1996
+.Dt LE 4 pmax
+.Os NetBSD 1.2
+.Sh NAME
+.Nm le
+.Nd
+DECstation AMD 7990 LANCE ethernet interface
+.Sh SYNOPSIS
+.Cd "le? at mainbus	with le_pmax"		(3100 baseboard)
+.Cd "le*? at tc	with le_tc"		(5000/200 baseboard)
+.Cd "le? at ioasic  with le_ioasic"	(ioasic baseboard)
+.Cd "le* at tc?	with le_tc"		(TC option cards)
+.Sh DESCRIPTION
+The
+.Nm
+driver provides access to a 10Mb/s Ethernet via the
+.Tn AMD
+7990
+.Tn LANCE
+Ethernet chip.  All
+.Tn LANCE
+interfaces on
+.Tn DECstations  
+are supported, as are interfaces on
+.Tn "Alpha AXP"
+machines with a
+.Tn TurboChannel
+bus.
+.Pp
+The
+.Nm 
+driver employs the Address Resolution Protocol described in
+.Xr arp 4
+to map between Internet and Ethernet addresses on the local
+network.  Selective reception of multicast Ethernet frames is provided
+by a 64-bit mask; multicast destination addresses are hashed to a
+bit entry using the Ethernet CRC function.
+.Pp
+No support is provided for switching between media ports.  The
+DECstation 3100 provides both AUI and BNC  (thinwire or 10base2) connectors.
+Port selection is via a manual switch and is not software configurable.
+The
+.Tn DECstation
+model 5000/200
+.Tn PMAD-AA
+baseboard device provides only a BNC connector.
+The
+.Nm ioasic
+baseboard devices and  the 
+.Tn PMAD-AA
+.Tn TurboChannel
+option card provide only an AUI port.
+.Pp
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr inet 4 ,
+.Xr tc 4 ,
+.Xr ioasic 4 ,
+.Xr arp 4 .
+.Sh BUGS
+On all front-ends, performance is impaired by hardware which forces
+forces a software copy of packets to and from DMA buffers.  The
+.Nm ioasic
+machines  and the DECstation 3100 must 
+copying packet to and from non-contiguous DMA buffers.
+The 
+DECstation 5000/200  and the
+.Tn PMAD-AA 
+must copy to and from an onboard SRAM DMA
+buffer.  The CPU overhead is noticeable, but all machines can sustain
+10Mbit media speed.
+.Sh HISTORY
+This
+.Nm
+driver is derived from a
+.NM
+driver that first appeared in
+.Bx 4.4 .
+Support for  multiple bus attachments first appeared in
+.Nx 1.2 .
diff --git a/share/man/man4/man4.pmax/lk201.4 b/share/man/man4/man4.pmax/lk201.4
new file mode 100644
index 00000000000..534a15ae64c
--- /dev/null
+++ b/share/man/man4/man4.pmax/lk201.4
@@ -0,0 +1,67 @@
+.\"
+.\" 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.
+.\" 3. 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: lk201.4,v 1.2 1997/10/13 11:23:53 lukem Exp $
+.\"	$OpenBSD: lk201.4,v 1.1 1998/03/09 15:35:51 millert Exp $
+.\"
+.Dd August 6, 1996
+.Dt LK201 4 pmax
+.Os NetBSD 1.2
+.Sh NAME
+.Nm lk201
+.Nd
+LK-201 keyboard input driver
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the
+.Tn Digital
+.Tn LK-201
+keyboard and successors.   This support is automatically configured
+into the kernel, to map input keypress events into ACSII codes.
+There is no way to disable this support.
+.Pp
+The kernel also includes support for an in-kernel ring-buffer
+structure for keypress events and pointer (mouse) events.  The
+.Nm fb
+driver redirects mouse and keyboard input into this in-kernel
+structure, and updates the position of a framebuffer cursor sprite to
+track the mouse.  This is for compatibility with the 
+.Nm qv
+QVSS-style software interface used by X11 on  DECstation and Vaxstation
+framebuffers.   This design offers significantly better performance
+on the Vaxstation-100 and Vaxstation-II, but makes it impossible
+to use alternative pointer or keyboard devices.
+.Sh BUGS
+The
+.Nm
+support should be re-written as a real driver or as a pseudo-device driver.
+The
+.Nm
+driver should use an in-kernel streams facility, if one existed.
diff --git a/share/man/man4/man4.pmax/px.4 b/share/man/man4/man4.pmax/px.4
new file mode 100644
index 00000000000..ffb2f8a8dc6
--- /dev/null
+++ b/share/man/man4/man4.pmax/px.4
@@ -0,0 +1,87 @@
+.\"
+.\" Copyright (c) 1997 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.
+.\" 3. 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: px.4,v 1.1 1997/11/08 07:27:56 jonathan Exp $
+.\"	$OpenBSD: px.4,v 1.1 1998/03/09 15:35:51 millert Exp $
+.\"
+.Dd November 11, 1997
+.Dt PX 4 pmax
+.Os NetBSD 1.3
+.Sh NAME
+.Nm px
+.Nd
+TurboChannel PMAG-C   2-D accelerated graphics board
+.Sh SYNOPSIS
+.Cd "px* at tc?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides minimal support for a
+.Tn DEC
+.Tn PMAG-C
+video display option card.
+The
+.Nm
+driver does nothing except remove the requirement to remove
+.Tn PMAG-C 
+cards in order to boot
+.Nx . 
+It offers no support for either raster consoles
+or X11 servers.
+To do either requires using the undocumented packet 
+protocol used to talk to the on-board blitter chip.
+.Pp
+.Sh SEE ALSO
+.Xr rcons 4 ,
+.Xr tc 4 ,
+.Xr ws 4 .
+.Sh BUGS
+.Pp
+Console output support and X11 server support should be implemented.
+They are not.
+.Pp
+The
+.Nm rcons
+glass-tty raster framebuffer console driver assumes
+direct bit read/write access to a framebuffer. The
+.Nm
+hardware does not provide this.
+.Nm rcons 
+should be replaced with a driver that allows a character-painting
+interface as well as direct blitting.
+.Pp
+The only known X
+server is an Ultrix binary which requires emulation of the Ultrix Xws
+ABI. Work on this is in progress.
+.Sh HISTORY
+The
+.Nm
+driver 
+first appeared in
+.Nx 1.3 .
diff --git a/share/man/man4/man4.pmax/scc.4 b/share/man/man4/man4.pmax/scc.4
new file mode 100644
index 00000000000..555d210c580
--- /dev/null
+++ b/share/man/man4/man4.pmax/scc.4
@@ -0,0 +1,108 @@
+.\"
+.\" 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.
+.\" 3. 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: scc.4,v 1.3 1997/11/03 11:19:21 jonathan Exp $
+.\"	$OpenBSD: scc.4,v 1.1 1998/03/09 15:35:52 millert Exp $
+.\"
+.Dd August 6, 1996
+.Dt SCC 4 pmax
+.Os NetBSD 1.2
+.Sh NAME
+.Nm scc
+.Nd
+Zilog serial communications interface
+.Sh SYNOPSIS
+.Cd "scc0 at ioasic?"
+.Cd "scc1 at ioasic?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the Zilog 8530 Serial Communications
+Controller (SCC) via the IOCTL asic on DECstation 5000 models
+in the /100, /20, and /240 series.   Each scc device has two serial
+ports. The model 20 provides one scc device.  Other models provide two,
+but one port of each device is dedicated to mouse and keyboard input,
+respectively.
+.Pp
+Input and output for each line may set to one of following baud rates;
+50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, 9600,
+19200, 38400, or 57600.
+Speeds up to 230400 are supported by the chip and the motherboard,
+but speeds  higher than 57600 do not work reliably without an external
+clock signal.
+.Sh FILES
+.Bl -tag -width Pa
+.It Pa /dev/ttya
+.It Pa /dev/ttyb
+.It Pa /dev/ttyc
+.It Pa /dev/ttyd
+.El
+.Pp
+The mapping from units to serial-hardware  outlets is idiosyncratic.
+the even ports are wired serial connectors and the odd-numbered ports
+are reserved for mouse and keyboard.
+On machines with one port like
+.Tn "Personal DECstations" ,
+the single device is
+.Pa ttya .
+On the 
+.Tn "5000/1xx" 
+and
+.Tn "5000/2xx" ,
+the first serial port (default serial console) is
+.Pa ttyc
+and the second port is 
+.Pa ttya .
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Bx 4.4 .
+.Sh BUGS
+The IOCTL asic provides internal DMA channels that can be programmed
+to transfer  up to 4096 bytes of data into, or out, of an SCC without
+further software intervention.  This feature of the ioctl asic is not
+yet supported.
+.Pp
+
+The mapping from device-special files (major and minor number) to chip
+and port is arguably backwards.
+.Tn Ultrix
+tries to hide the hardware  mapping, but
+.Nx
+does not.  Users wanting to use
+.Tn "Ultrix"
+compatible tty names 
+.Pa /dev/tty0
+and
+.Pa /dev/tty1
+for the
+.Nm
+comm-port lines should make links or device-special files which match
+their hardware setup.
diff --git a/share/man/man4/man4.pmax/sii.4 b/share/man/man4/man4.pmax/sii.4
new file mode 100644
index 00000000000..103c24ee83f
--- /dev/null
+++ b/share/man/man4/man4.pmax/sii.4
@@ -0,0 +1,97 @@
+.\"
+.\" 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.
+.\" 3. 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: sii.4,v 1.2 1997/10/13 11:23:58 lukem Exp $
+.\"	$OpenBSD: sii.4,v 1.1 1998/03/09 15:35:52 millert Exp $
+.\"
+.Dd August 6, 1996
+.Dt SII 4 pmax
+.Os NetBSD 1.2
+.Sh NAME
+.Nm sii
+.Nd
+SII scsi adaptor
+.Sh SYNOPSIS
+.Cd "sii0 at mainbus"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the
+.Tn DEC
+SII scsi adaptor ASIC used in
+the DECstation 2100, 3100, and 5100,  and in the VAXstation 3100.
+.Pp
+The
+.Nm
+is a medium-performance implementation of the SCSI-I common set
+supporting synchronous and asynchronous SCSI devices.  The SII cabling
+is unusual:  the bulkhead connector is very similar to a standard
+submicro wide SCSI-II connector, but has the other gender.
+The
+.Nm
+chip only supports DMA to or from a fixed window in memory.
+The driver use this area as a bounce buffer,  copying data to and
+from the  DMA region.
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr rz 4 ,
+.Xr tz 4 ,
+.Xr sd 4 ,
+.Xr st 4 ,
+.Xr cd 4 ,
+.Xr ch 4 .
+.Sh HISTORY
+The
+.Nm
+driver
+first appeared in
+.Bx 4.4 .
+.Sh BUGS
+The
+.Nm
+driver only supports the
+.Nm oldscsibus
+higher-level layer, and the
+.Nm rz
+and
+.Nm tz
+devices, which first appeared in 
+.Bx 4.4 /pmax.
+It should be  re-written to support the
+.Nm scsibus
+machine-independent higher-level SCSI layer and the
+.Nm sd ,
+.Nm st ,
+and
+.Nm cd
+drivers. This is
+.Ud .
+
+
+
diff --git a/share/man/man4/man4.pmax/tc.4 b/share/man/man4/man4.pmax/tc.4
new file mode 100644
index 00000000000..302fe2ad54a
--- /dev/null
+++ b/share/man/man4/man4.pmax/tc.4
@@ -0,0 +1,69 @@
+.\"
+.\" Copyright (c) 1996, 1997 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.
+.\" 3. 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: tc.4,v 1.3 1997/11/08 07:27:55 jonathan Exp $
+.\"	$OpenBSD: tc.4,v 1.1 1998/03/09 15:35:52 millert Exp $
+.\"
+.Dd August 6, 1996
+.Dt TC 4 pmax
+.Os NetBSD 1.2
+.Sh NAME
+.Nm tc
+.Nd
+TurboChannel SCSI adaptor
+.Sh SYNOPSIS
+.Cd "tc? at mainbus"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the DEC TurboChannel expansion
+bus on DECstation 5000 series machines. TurboChannel is a 32-bit wide
+synchronous DMA-capable bus, running at 25 Mhz on higher-end machines
+and at 12.5MHz on lower-end machines.
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr asc 4 ,
+.Xr ioasic 4 ,
+.Xr le 4 ,
+.Xr cfb 4 ,
+.Xr sfb 4 ,
+.Xr mfb 4 ,
+.Xr px 4 .
+.Sh HISTORY
+The
+.Nm
+driver
+first appeared in
+.Nx 1.1 .
+.Sh BUGS
+.Pp
+The
+.Nm
+driver makes poor use of interrupt priority on the 5000/1xx
+series.