1.\" $OpenBSD: addcom.4,v 1.5 2003/08/31 19:53:42 jmc Exp $ 2.\" 3.\" Copyright (c) 2001 Jason L. Wright (jason@thought.net) 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18.\" DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 19.\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 23.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 24.\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25.\" POSSIBILITY OF SUCH DAMAGE. 26.\" 27.\" 28.Dd July 16, 2001 29.Dt ADDCOM 4 30.Os 31.Sh NAME 32.Nm addcom 33.Nd multiplexing serial communications interface 34.Sh SYNOPSIS 35.Cd "addcom0 at isa? port 0x108 irq 5" 36.Cd "com* at addcom? slave ?" 37or 38.Cd "pccom* at addcom? slave ?" 39.Sh DESCRIPTION 40The 41.Nm 42driver provides support for Addonics FlexPort 8/S (and probably FlexPort 4/S) 43boards that multiplex together up to eight (or four) 44.Tn EIA 45.Tn RS-232C 46.Pf ( Tn CCITT 47.Tn V.28 ) 48communications interfaces. 49.Pp 50Each 51.Nm 52device is the master device for up to eight 53.Nm com 54devices. 55The kernel configuration specifies these 56.Nm com 57devices as slave devices of the 58.Nm 59device, as shown in 60.Sx SYNOPSIS . 61The slave ID given for each 62.Nm com 63device determines which bit in the interrupt multiplexing register is 64tested to find interrupts for that device. 65The 66.Tn port 67specification for the 68.Nm 69device is used to compute the base addresses for the 70.Nm com 71subdevices. 72The port for the interrupt multiplexing register is fixed, 73so it is doubtful that more than one 74.Nm 75can be used in a machine. 76.Sh FILES 77.Bl -tag -width Pa 78.It Pa /dev/tty?? 79.El 80.Sh SEE ALSO 81.Xr com 4 , 82.Xr intro 4 , 83.Xr isa 4 84.Sh HISTORY 85.Ox 86support for 87.Nm 88devices first appeared in 89.Ox 3.0 . 90