1.\" $OpenBSD: hsq.4,v 1.8 2001/06/26 02:09:07 pjanzen 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. All advertising materials mentioning features or use of this software 20.\" must display the following acknowledgement: 21.\" This product includes software developed by the University of 22.\" California, Berkeley and its contributors. 23.\" 4. Neither the name of the University nor the names of its contributors 24.\" may be used to endorse or promote products derived from this software 25.\" without specific prior written permission. 26.\" 27.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37.\" SUCH DAMAGE. 38.\" 39.\" from: @(#)dca.4 5.2 (Berkeley) 3/27/91 40.\" from: Id: com.4,v 1.1 1993/08/06 11:19:07 cgd Exp 41.\" 42.Dd March 30, 1994 43.Dt HSQ 4 44.Os 45.Sh NAME 46.Nm hsq 47.Nd multiplexing serial communications interface 48.Sh SYNOPSIS 49.Cd "hsq0 at isa? port 0x140 irq 10" 50.Cd "pccom* at hsq? slave ?" 51.Sh DESCRIPTION 52The 53.Nm 54driver provides support for Hostess (Comtrol Corporation, 55www.comtrol.com) and compatible boards that multiplex together 56up to four 57.Tn EIA 58.Tn RS-232C 59.Pf ( Tn CCITT 60.Tn V.28 ) 61communications interfaces. 62.Pp 63Each 64.Nm 65device is the master device for up to four 66.Nm pccom 67devices. The kernel configuration specifies these 68.Nm pccom 69devices as slave devices of the 70.Nm 71device, as shown in the synopsis. The slave ID given for each 72.Nm pccom 73device determines which bit in the interrupt multiplexing register is 74tested to find interrupts for that device. 75The 76.Tn port 77specification for the 78.Nm 79device is used to compute the base addresses for the 80.Nm pccom 81subdevices (they are equal to 82.Tn port 83+ ID * 8) and the port for the interrupt multiplexing register 84(it is equal to 85.Tn port 86+ 7). More 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 94.It Pa /dev/tty0? 95.It Pa /dev/cua0? 96.El 97.Sh SEE ALSO 98.Xr pccom 4 99.Sh HISTORY 100The 101.Nm 102driver was written by Denis A. Doroshenko based on 103.Xr ast 4 104driver. 105