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+.\"	$NetBSD: bah.4,v 1.2 1995/06/06 23:41:37 cgd Exp $
+.\"
+.\" Copyright (c) 1995 Ignatios Souvatzis
+.\" 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 Ignatios Souvatzis
+.\"      for the NetBSD project.
+.\" 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.
+.\"
+
+.\" The following requests are required for all man pages.
+.Dd May 31, 1995
+.Os NetBSD 1.0
+.Dt BAH 4 amiga
+.Sh NAME
+.Nm bah
+.Nd ARCnet 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
+ARCnet chip set.
+.Pp
+Each of the host's network addresses
+is specified at boot time with an
+.Dv SIOCSIFADDR
+.Xr ioctl .
+The
+.Nm
+interface 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
+.Xr RFC 1051
+and
+.Xr RFC 1201
+as one option.
+.Pp
+With the IFF_LINK0 flag cleared, IP encoding is done according to the
+deprecated, but popular among Amiga users, RFC 1051 encoding (that
+is, with simple header, packet type 240), and the MTU is 507.
+.Pp 
+With the IFF_LINK0 flag set, IP encoding is done according to RFC 1201 (that 
+is, with Packet Header Definition Standard header and packet type 212). The MTU
+is normally 1500.
+.Pp
+When switching between the two modes, do a 
+.Cd ifconfig interfacename down up
+to switch the mtu.
+.Pp
+.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 arp 4 ,
+.Xr ifconfig 8 ,
+.Xr inet 4 ,
+.Xr intro 4 ,
+.Xr RFC1051 
+,
+.Xr RFC1201
+.br
+ARCnet Packet Header Definition Standard, Novell Inc., 1989
+.Sh STANDARDS
+RFC 1051 / RFC1201 without ARP, using direct mapping of lower 8 IP
+address bits instead.
+.Sh HISTORY
+The
+.Tn Amiga
+.Nm
+interface first appeared in
+.Nx 1.0a
+.Sh AUTHOR
+Ignatios Souvatzis