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<table class="head">
<tr>
<td class="head-ltitle">HARMONY(4)</td>
<td class="head-vol">Device Drivers Manual (hppa)</td>
<td class="head-rtitle">HARMONY(4)</td>
</tr>
</table>
<div class="manual-text">
<section class="Sh">
<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
<p class="Pp"><code class="Nm">harmony</code> —
<span class="Nd">CS4215/AD1849 audio interface</span></p>
</section>
<section class="Sh">
<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
<p class="Pp"><code class="Cd">harmony* at gsc?</code>
<br/>
<code class="Cd">audio* at harmony?</code></p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<p class="Pp">The <code class="Nm">harmony</code> device uses the Crystal
Semiconductor CS4215 16-Bit Multimedia Audio Codec or Analog Devices AD1849
SoundPort(R) Stereo Codec chip to implement the audio device interface
described in <a class="Xr">audio(4)</a>. This device is found on most HP
PA-RISC workstations. The <code class="Nm">harmony</code> has a maximum
precision of 16 bits with a maximum 48000 Hz sample rate, and has stereo
input and stereo output.</p>
<p class="Pp">On HP 9000/712 models <code class="Nm">harmony</code> also
provides two additional channels for an add-on card with two fax/voice
modems.</p>
<p class="Pp">One of the hardware registers reflects the state of the CHI bus
that is used to communicate with the codec and thus being sampled at a low
accuracy secondary frequency (such as <a class="Xr">timeout(9)</a>) produces
a poor quality random bit stream that is fed into the entropy pool of
<a class="Xr">rnd(4)</a>.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="MACHINES"><a class="permalink" href="#MACHINES">MACHINES</a></h1>
<p class="Pp">An incomplete list of machines that feature
<code class="Nm">harmony</code> audio:</p>
<p class="Pp"></p>
<ul class="Bl-bullet Bl-compact">
<li>712/*</li>
<li>715/*</li>
<li>725/*</li>
<li>735/*</li>
<li>755/*</li>
<li>B132L[+], B160L, B180L+</li>
<li>C100, C110, C132L, C160[L], C180, C200, C240, C360</li>
<li>J200, J210[XC], J280, J282, J2240</li>
</ul>
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
ALSO</a></h1>
<p class="Pp"><a class="Xr">hppa/ioctl(2)</a>, <a class="Xr">audio(4)</a>,
<a class="Xr">hppa/gsc(4)</a>, <a class="Xr">hppa/intro(4)</a>,
<a class="Xr">rnd(4)</a></p>
</section>
<section class="Sh">
<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
<p class="Pp">Support for <code class="Nm">harmony</code> first appeared in
<span class="Ux">OpenBSD 3.3</span>. It was ported to
<span class="Ux">NetBSD 1.6</span> by Chuck Silvers.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="CAVEATS"><a class="permalink" href="#CAVEATS">CAVEATS</a></h1>
<p class="Pp">To trigger entropy collection, the CHI bus has to be programmed
into the data mode that happens once a single buffer of data has been played
or recorded.</p>
</section>
</div>
<table class="foot">
<tr>
<td class="foot-date">May 15, 2022</td>
<td class="foot-os">NetBSD 10.1</td>
</tr>
</table>
|
