$NetBSD: attimer.4,v 1.4 2009/03/09 19:24:28 joerg Exp $
Copyright (c) 2005 The NetBSD Foundation.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.Dd March 22, 2005 .Dt ATTIMER 4 .Os .Sh NAME .Nm attimer .Nd AT Timer (8253) driver .Sh SYNOPSIS .Cd "attimer* at acpi?" .Cd "attimer0 at isa?" .Sh DESCRIPTION The .Nm driver handles the so-called AT Timer device, initially found as chip model 8253. It is used as the main counter for the clock on the i386 port, but also offers control over the pitch of the PC speaker.
Copyright (c) 2005 The NetBSD Foundation.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
.Dd March 22, 2005 .Dt ATTIMER 4 .Os .Sh NAME .Nm attimer .Nd AT Timer (8253) driver .Sh SYNOPSIS .Cd "attimer* at acpi?" .Cd "attimer0 at isa?" .Sh DESCRIPTION The .Nm driver handles the so-called AT Timer device, initially found as chip model 8253. It is used as the main counter for the clock on the i386 port, but also offers control over the pitch of the PC speaker.
p The .Nm driver currently only implements the access to the ISA register .Dq TIMER1 which controls the pitch of the PC speaker, and should be configured along with .Xr pcppi 4 to be of any actual use. .Sh SEE ALSO .Xr acpi 4 , .Xr isa 4 , .Xr pcppi 4
Indexes created Sun Sep 21 16:09:51 GMT 2025