76 lines
2.4 KiB
Groff
76 lines
2.4 KiB
Groff
.\" $NetBSD: pcppi.4,v 1.6 2003/02/19 10:48:00 drochner Exp $
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.\"
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.\" Copyright (c) 1999
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.\" Matthias Drochner. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd April 21, 1999
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.Os
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.Dt PCPPI 4
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.Sh NAME
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.Nm pcppi
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.Nd PC (ISA) control and timer port driver
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.Sh SYNOPSIS
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.Cd "pcppi* at isa?"
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.Cd "isabeep* at pcppi?"
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(alpha only)
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.Cd "sysbeep* at pcppi?"
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(i386 only)
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.Cd "spkr0 at pcppi?"
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.Cd "midi* at pcppi?"
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.Sh DESCRIPTION
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The
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.Nm
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driver handles resource allocation and device attachment for the
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ports related to the ISA speaker in the traditional PC/AT
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.Dq design .
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These are the
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.Dq system control port
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(which was implemented by the 8255
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.Dq PPI
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in the XT, hence the name of this driver)
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at IO address 0x61 and the first 8253 timer at 0x40-0x43.
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.Pp
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The
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.Nm
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driver provides its child devices with the ability to output simple
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tones through the PC speaker. The
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.Xr speaker 4
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and
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.Xr midi 4
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devices use this to synthesize sounds.
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The
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.Xr isabeep 4
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and
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.Xr sysbeep 4
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devices are helpers which the
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.Xr pckbd 4
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driver uses as a substitute for a
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.Dq keyboard beep ,
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because the PC keyboard hardware doesn't provide this.
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.Sh SEE ALSO
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.Xr isa 4 ,
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.Xr midi 4 ,
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.Xr pckbd 4 ,
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.Xr speaker 4
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