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+.\"     $OpenBSD: harmony.4,v 1.9 2007/05/31 19:19:54 jmc Exp $
+.\"
+.\"
+.\" Copyright (c) 2003 Jason L. Wright (jason@thought.net)
+.\" 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 ``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 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: May 31 2007 $
+.Dt HARMONY 4 hppa
+.Os
+.Sh NAME
+.Nm harmony
+.Nd CS4215/AD1849 audio device
+.Sh SYNOPSIS
+.Cd "harmony* at gsc? irq 13"
+.Cd "audio*  at harmony?"
+.Sh DESCRIPTION
+The
+.Nm
+device uses the
+.Tn Crystal Semiconductor
+.Tn CS4215
+16-Bit Multimedia Audio Codec
+or
+.Tn Analog Devices
+.Tn AD1849
+.Tn SoundPort(R) Stereo Codec
+chip to implement the audio device interface described in
+.Xr audio 4 .
+This device is found on most
+.Tn HP PA-RISC
+workstations.
+The
+.Nm
+has a maximum precision of 16 bits and has a stereo input and stereo output.
+.Pp
+On
+.Tn HP 9000/712
+models
+.Nm
+also provides two additional channels for an add-on
+card with two fax/voice modems.
+.Pp
+One of the hardware registers reflects the state of the
+.Tn CHI
+bus that is used to communicate with the codec and thus
+being sampled at a low accuracy secondary frequency
+(such as
+.Xr timeout 9 )
+produces poor quality random bit stream that is fed into the
+entropy pool of
+.Xr random 4 .
+.Sh SEE ALSO
+.Xr ioctl 2 ,
+.Xr audio 4 ,
+.Xr gsc 4 ,
+.Xr intro 4 ,
+.Xr random 4
+.Sh HISTORY
+.Ox
+support for
+.Nm
+first appeared in
+.Ox 3.3 .
+.Sh CAVEATS
+To trigger entropy collection
+.Tn CHI
+bus has to be programmed into the data mode that happens once
+a single buffer of data has been played or recorded.