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+.\" $OpenBSD: pcppi.4,v 1.12 2010/07/31 09:38:03 jmc Exp $
+.\" $NetBSD: pcppi.4,v 1.5 2001/10/02 20:37:00 augustss Exp $
+.\"
+.\" Copyright (c) 1999
+.\" 	Matthias Drochner.  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 AUTHOR 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 AUTHOR 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 $Mdocdate: July 31 2010 $
+.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?"
+.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
+device uses 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 pckbd 4 ,
+.Xr speaker 4