NetBSD-5.0.2/share/man/man4/man4.hp700/harmony.4

.\"     $NetBSD: harmony.4,v 1.1 2004/09/22 16:38:26 jkunz Exp $
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.\" Copyright (c) 2003 Jason L. Wright (jason@thought.net)
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.Dd January 26, 2003
.Dt HARMONY 4 hp700
.Os
.Sh NAME
.Nm harmony
.Nd CS4215/AD1849 audio interface
.Sh SYNOPSIS
.Cd "harmony* at gsc?"
.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 rnd 4 .
.Sh MACHINES
An incomplete list of machines that feature
.Nm
audio:
.Pp
.Bl -bullet -compact
.It
712/*
.It
715/*
.It
725/*
.It
735/*
.It
755/*
.It
B132L[+], B160L, B180L+
.It
C100, C110, C132L, C160[L], C180, C200, C240, C360
.It
J200, J210[XC], J280, J282, J2240
.El
.Sh SEE ALSO
.Xr ioctl 2 ,
.Xr audio 4 ,
.Xr gsc 4 ,
.Xr intro 4 ,
.Xr rnd 4
.Sh HISTORY
Support for
.Nm
first appeared in
.Ox 3.3 .
It was ported to
.Nx 1.6
by Chuck Silvers.
.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.