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+.\"	$NetBSD: bah.4,v 1.19 2017/02/18 22:39:00 wiz Exp $
+.\"
+.\" Copyright (c) 1995, 1997 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Ignatios Souvatzis.
+.\"
+.\" 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.
+.\"
+.\" The following requests are required for all man pages.
+.Dd February 17, 2017
+.Dt BAH 4 amiga
+.Os
+.Sh NAME
+.Nm bah
+.Nd ARCnet network driver for SMC COM90C26 based boards
+.Sh SYNOPSIS
+.Cd "bah* at zbus0"
+.Sh DESCRIPTION
+The
+.Nm
+interface provides access to the 2.5 Mb/s ARCnet network via the
+.Tn SMC
+COM90C26 + COM90C32
+ARCnet chip set.
+.Pp
+Each of the host's network addresses
+is specified at boot time with an
+.Dv SIOCSIFADDR
+.Xr ioctl 2 .
+The interface MTU is 507 for protocols that do not use link level fragmentation
+and 60480 bytes for the others. The routing layer may specify additional
+limits.
+.br
+Currently supported protocols are IPv4(+ARP), and IPv6.
+.Sh IP VERSION 4 CONSIDERATIONS
+When the NOARP flag is set on the
+.Nm
+interface,
+it does not employ the address resolution protocol described in
+.Xr arp 4
+to dynamically map between Internet and Ethernet addresses on the local
+network. Instead, it uses the least significant 8 bits of the IP address
+as hardware address, as described in RFC 1051 and  RFC 1201.
+.Pp
+With the IFF_LINK0 flag cleared, IP and ARP encoding is done according to the
+deprecated, but popular among Amiga users, RFC 1051 encoding (that
+is, with simple header, packet type 240 / 241), and the MTU is 507.
+.Pp
+With the IFF_LINK0 flag set, IP/ARP/RARP encoding is done according to RFC 1201
+(that is, with Packet Header Definition Standard header and packet type
+212/213). The MTU is normally 1500.
+.Pp
+When switching between the two modes, do a
+.Cd ifconfig interfacename down up
+to switch the MTU.
+.Pp
+When the IFF_LINK2 flag is set, ARP packets are sent with the protocol type
+encoded as it would be in the  ARCnet header, and decoded to the right protocol
+encoding on reception. According to "assigned numbers", this is wrong, but
+some legacy software (namely, AmiTCP 3.0beta) shows this bug.
+.Sh HARDWARE
+The
+.Nm
+interface supports the following Zorro II expansion cards:
+.Bl -tag -width "AMERISTAR" -offset indent
+.It Em A2060
+Commodore's ARCnet card, manufacturer\ 514, product\ 9
+.It Em AMERISTAR
+Ameristar's ARCnet card, manufacturer\ 1053, product\ 9
+.El
+.Sh SEE ALSO
+.Xr amiga/intro 4 ,
+.Xr arp 4 ,
+.Xr inet 4 ,
+.Xr ifconfig 8
+.Rs
+.%J RFC
+.%N 1051
+.%D March 1988
+.%T "Standard for the transmission of IP datagrams and ARP packets over ARCNET networks."
+.%A P.A. Prindeville
+.Re
+.Rs
+.%J RFC
+.%N 1201
+.%T "Transmitting IP traffic over ARCNET networks."
+.%A D. Provan
+.%D February 1991
+.Re
+.Rs
+.%J RFC
+.%N 2497
+.%T "Transmission of IPv6 Packets over ARCnet Networks."
+.%A I. Souvatzis
+.%D January 1999
+.Re
+.Pp
+ARCnet Packet Header Definition Standard, Novell Inc., 1989
+.Sh STANDARDS
+RFC 1051/RFC1201 with ARP, or without, using direct mapping of lower 8 IP
+address bits instead.
+.Sh HISTORY
+The
+.Tn Amiga
+.Nm
+interface first appeared in
+.Nx 1.1 .
+ARP support was added in
+.Nx 1.3 .
+.Sh AUTHORS
+.An Ignatios Souvatzis