static/netbsd/man4/attimer.4 4.html


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

<table class="head">
  <tr>
    <td class="head-ltitle">ATTIMER(4)</td>
    <td class="head-vol">Device Drivers Manual</td>
    <td class="head-rtitle">ATTIMER(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">attimer</code> &#x2014; <span class="Nd">AT Timer
    (8253) 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">attimer*	at acpi?</code>
  <br/>
  <code class="Cd">attimer0	at isa?</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">attimer</code> driver handles the so-called
    AT Timer device, initially found as chip model 8253. It is used as the main
    counter for the clock on the i386 port, but also offers control over the
    pitch of the PC speaker.</p>
<p class="Pp">The <code class="Nm">attimer</code> driver currently only
    implements the access to the ISA register &#x201C;TIMER1&#x201D; which
    controls the pitch of the PC speaker, and should be configured along with
    <a class="Xr">pcppi(4)</a> to be of any actual use.</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">isa(4)</a>,
    <a class="Xr">pcppi(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>