static/netbsd/man4/pcppi.4 4.html


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<table class="head">
  <tr>
    <td class="head-ltitle">PCPPI(4)</td>
    <td class="head-vol">Device Drivers Manual</td>
    <td class="head-rtitle">PCPPI(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">pcppi</code> &#x2014; <span class="Nd">PC (ISA)
    control port driver</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">pcppi* at acpi?</code>
  <br/>
  <code class="Cd">pcppi* at isa?</code>
  <br/>
  <code class="Cd">isabeep* at pcppi?</code> (alpha only)
  <br/>
  <code class="Cd">sysbeep* at pcppi?</code> (i386 only)
  <br/>
  <code class="Cd">spkr0 at pcppi?</code>
  <br/>
  <code class="Cd">midi* at pcppi?</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">pcppi</code> driver handles resource
    allocation and device attachment for the ports related to the ISA speaker in
    the traditional PC/AT &#x201C;design&#x201D;. These are the &#x201C;system
    control port&#x201D; (which was implemented by the 8255 &#x201C;PPI&#x201D;
    in the XT, hence the name of this driver) at IO address 0x61.</p>
<p class="Pp">When associated with an <a class="Xr">attimer(4)</a> device, it is
    possible to change the pitch of the sounds emitted through
    <code class="Nm">pcppi</code>.</p>
<p class="Pp">The <code class="Nm">pcppi</code> driver provides its child
    devices with the ability to output simple tones through the PC speaker. The
    <a class="Xr">speaker(4)</a> and <a class="Xr">midi(4)</a> devices use this
    to synthesize sounds. The <a class="Xr">isabeep(4)</a> and
    <a class="Xr">sysbeep(4)</a> devices are helpers which the
    <a class="Xr">pckbd(4)</a> driver uses as a substitute for a
    &#x201C;keyboard beep&#x201D;, because the PC keyboard hardware doesn't
    provide this.</p>
</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">acpi(4)</a>, <a class="Xr">attimer(4)</a>,
    <a class="Xr">isa(4)</a>, <a class="Xr">midi(4)</a>,
    <a class="Xr">pckbd(4)</a>, <a class="Xr">speaker(4)</a></p>
</section>
</div>
<table class="foot">
  <tr>
    <td class="foot-date">March 22, 2005</td>
    <td class="foot-os">NetBSD 10.1</td>
  </tr>
</table>