1.\" $OpenBSD: hsq.4,v 1.16 2008/05/21 19:05:51 kettenis Exp $ 2.\" from: OpenBSD: ast.4,v 1.5 1999/07/09 13:35:43 aaron Exp 3.\" from: NetBSD: ast.4,v 1.7 1996/03/16 00:07:07 thorpej Exp 4.\" 5.\" Copyright (c) 1990, 1991 The Regents of the University of California. 6.\" All rights reserved. 7.\" 8.\" This code is derived from software contributed to Berkeley by 9.\" the Systems Programming Group of the University of Utah Computer 10.\" Science Department. 11.\" Redistribution and use in source and binary forms, with or without 12.\" modification, are permitted provided that the following conditions 13.\" are met: 14.\" 1. Redistributions of source code must retain the above copyright 15.\" notice, this list of conditions and the following disclaimer. 16.\" 2. Redistributions in binary form must reproduce the above copyright 17.\" notice, this list of conditions and the following disclaimer in the 18.\" documentation and/or other materials provided with the distribution. 19.\" 3. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" from: @(#)dca.4 5.2 (Berkeley) 3/27/91 36.\" from: Id: com.4,v 1.1 1993/08/06 11:19:07 cgd Exp 37.\" 38.Dd $Mdocdate: May 21 2008 $ 39.Dt HSQ 4 40.Os 41.Sh NAME 42.Nm hsq 43.Nd multiplexing serial communications interface 44.Sh SYNOPSIS 45.Cd "hsq0 at isa? port 0x140 irq 10" 46.Cd "com* at hsq?" 47.Sh DESCRIPTION 48The 49.Nm 50driver provides support for Hostess (Comtrol Corporation, 51www.comtrol.com) and compatible boards that multiplex together 52up to four 53.Tn EIA 54.Tn RS-232C 55.Pf ( Tn CCITT 56.Tn V.28 ) 57communications interfaces. 58.Pp 59Each 60.Nm 61device is the master device for up to four 62.Nm com 63devices. 64The kernel configuration specifies these 65.Nm com 66devices as slave devices of the 67.Nm 68device, as shown in 69.Sx SYNOPSIS . 70The slave ID given for each 71.Nm com 72device determines which bit in the interrupt multiplexing register is 73tested to find interrupts for that device. 74The 75.Tn port 76specification for the 77.Nm 78device is used to compute the base addresses for the 79.Nm com 80subdevices (they are equal to 81.Tn port 82+ ID * 8) and the port for the interrupt multiplexing register 83(it is equal to 84.Tn port 85+ 7). 86More technical details on how the driver works can be found in 87the big comment at the beginning of the driver's source code. 88.Pp 89Information on setup of card's configuration switches should be taken 90from Comtrol Corporation's web site, since the author wrote and tested 91the driver only with Hostess-compatible cards. 92.Sh FILES 93.Bl -tag -width Pa -compact 94.It Pa /dev/tty0? 95.It Pa /dev/cua0? 96.El 97.Sh SEE ALSO 98.Xr com 4 , 99.Xr intro 4 , 100.Xr isa 4 101.Sh HISTORY 102The 103.Nm 104driver was written by Denis A. Doroshenko based on the 105.Xr ast 4 106driver. 107