1.\" $NetBSD: attimer.4,v 1.1 2005/03/25 23:30:56 cube Exp $ 2.\" 3.\" Copyright (c) 2005 The NetBSD Foundation. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to the NetBSD Foundation 7.\" by Quentin Garnier. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the NetBSD 20.\" Foundation, Inc. and its contributors. 21.\" 4. Neither the name of The NetBSD Foundation nor the names of its 22.\" contributors may be used to endorse or promote products derived 23.\" from this software without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35.\" POSSIBILITY OF SUCH DAMAGE. 36.\" 37.Dd March 22, 2005 38.Os 39.Dt ATTIMER 4 40.Sh NAME 41.Nm attimer 42.Nd AT Timer (8253) driver 43.Sh SYNOPSIS 44.Cd "attimer* at acpi?" 45.Cd "attimer0 at isa?" 46.Sh DESCRIPTION 47The 48.Nm 49driver handles the so-called AT Timer device, initially found as chip 50model 8253. 51It is used as the main counter for the clock on the i386 port, 52but also offers control over the pitch of the PC speaker. 53.Pp 54The 55.Nm 56driver currently only implements the access to the ISA register 57.Dq TIMER1 58which controls the pitch of the PC speaker, 59and should be configured along with 60.Xr pcppi 4 61to be of any actual use. 62.Sh SEE ALSO 63.Xr acpi 4 , 64.Xr isa 4 , 65.Xr pcppi 4 66