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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> &#x2014;
- <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>