NetBSD/share/man/man4/ioat.4

.\"	$NetBSD: ioat.4,v 1.6 2009/04/10 15:26:14 joerg Exp $
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.\" This code is derived from software contributed to Berkeley by
.\" the Systems Programming Group of the University of Utah Computer
.\" Science Department.
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.\"	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.