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+.\"	$NetBSD: ioat.4,v 1.6 2009/04/10 15:26:14 joerg Exp $
+.\"
+.\" Copyright (c) 1990, 1991 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the Systems Programming Group of the University of Utah Computer
+.\" Science Department.
+.\" 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. 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: NetBSD: boca.4,v 1.3 1999/03/16 01:19:15 garbled Exp
+.\"     from: @(#)dca.4	5.2 (Berkeley) 3/27/91
+.\"	from: Id: com.4,v 1.1 1993/08/06 11:19:07 cgd Exp
+.\"
+.Dd January 24, 2000
+.Dt IOAT 4
+.Os
+.Sh NAME
+.Nm ioat
+.Nd
+multiplexing serial communications interface
+.Sh SYNOPSIS
+For 6-port BOCA IOAT66 board:
+.Pp
+.Cd "ioat0   at isa? port 0x220 irq 5"
+.Cd "com2    at ioat? slave ?"
+.Cd "com3    at ioat? slave ?"
+.Cd "com4    at ioat? slave ?"
+.Cd "com5    at ioat? slave ?"
+.Cd "com6    at ioat? slave ?"
+.Cd "com7    at ioat? slave ?"
+.Sh DESCRIPTION
+The
+.Nm ioat
+driver provides support for BOCA Research IOAT66
+boards that multiplex together up to six
+.Tn EIA
+.Tn RS-232C
+.Pf ( Tn CCITT
+.Tn V.28 )
+communications interfaces.
+.Pp
+Each
+.Nm
+device is the master device for up to six
+.Nm com
+devices.  The kernel configuration specifies these
+.Nm com
+devices as slave devices of the
+.Nm
+device, as shown in the synopsis.  The slave ID given for each
+.Nm com
+device determines which bit in the interrupt multiplexing register is
+tested to find interrupts for that device.
+The
+.Tn port
+specification for the
+.Nm
+device is used to compute the base addresses for the
+.Nm com
+subdevices. The port for the interrupt multiplexing register is not
+programmable.
+.Sh FILES
+.Bl -tag -width Pa
+.It Pa /dev/tty??
+.El
+.Sh SEE ALSO
+.Xr com 4
+.Sh HISTORY
+The
+.Nm
+driver was adapted from the boca driver by Michael Richardson.