.\" $OpenBSD: pcppi.4,v 1.10 2008/01/26 23:07:55 jmc Exp $
.\" $NetBSD: pcppi.4,v 1.5 2001/10/02 20:37:00 augustss Exp $
.\"
.\" Copyright (c) 1999
.\" 	Matthias Drochner.  All rights reserved.
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.Dd $Mdocdate: January 26 2008 $
.Dt PCPPI 4
.Os
.Sh NAME
.Nm pcppi
.Nd PC (ISA) control and timer port driver
.Sh SYNOPSIS
.Cd "pcppi*   at isa?"
.Cd "spkr0    at pcppi?"
.Cd "midi*    at pcppi?"
.Sh DESCRIPTION
The
.Nm
driver handles resource allocation and device attachment for the
ports related to the ISA speaker in the traditional PC/AT
.Dq design .
These are the
.Dq system control port
(which was implemented by the 8255
.Dq PPI
in the XT, hence the name of this driver)
at I/O address 0x61 and the first 8253 timer at 0x40-0x43.
.Pp
The
.Nm
driver provides its child devices with the ability to output simple
tones through the PC speaker.
The
.Xr speaker 4
and
.Xr midi 4
devices use this to synthesize sounds.
It also provides helper functions to the
.Xr pckbd 4
driver as a substitute for a
.Dq keyboard beep ,
because the PC keyboard hardware doesn't provide this.
.Sh SEE ALSO
.Xr intro 4 ,
.Xr isa 4 ,
.Xr midi 4 ,
.Xr pckbd 4 ,
.Xr speaker 4