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-<table class="head">
- <tr>
- <td class="head-ltitle">DHU(4)</td>
- <td class="head-vol">Device Drivers Manual (vax)</td>
- <td class="head-rtitle">DHU(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">dhu</code> &#x2014;
- <span class="Nd">DHU-11/DHV-11 serial communications multiplexer</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">dhu0 at uba0 csr 0160440</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">A DHU-11 provides 16 communication lines.</p>
-<p class="Pp">Normal I/O control parameters for individual lines are managed by
- <a class="Xr">ioctl(2)</a> calls. Individual DHU-11 lines may be configured
- to run at any of 13 speeds (50, 200 and 38400 baud are not available); the
- speed may be set via <a class="Xr">getty(8)</a> or <a class="Xr">stty(1)</a>
- or may be communicated by other programs which use
- <a class="Xr">ioctl(2)</a> such as <a class="Xr">ifconfig(8)</a>, see
- <a class="Xr">tty(4)</a>.</p>
-<p class="Pp">The DHU-11 driver normally uses input silos and delays receiver
- interrupts by 20 milliseconds rather than taking an interrupt on each input
- character.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="FILES"><a class="permalink" href="#FILES">FILES</a></h1>
-<dl class="Bl-tag Bl-compact">
- <dt><span class="Pa">/dev/tty[S-Z][0-9a-f]</span></dt>
- <dd style="width: auto;">&#x00A0;</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="NOTES"><a class="permalink" href="#NOTES">NOTES</a></h1>
-<p class="Pp">The driver currently does not make full use of the hardware
- capabilities of the DHU-11, for dealing with XON/XOFF flow-control or
- hard-wired lines for example.</p>
-<p class="Pp">Although the devices are not the same, a DHU-11 can convince the
- DH-11 autoconfiguration code that it is a DH-11.</p>
-<p class="Pp">The 4 40-way cables are a pain.</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">tty(4)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">dhu</code> driver appeared in
- <span class="Ux">4.3BSD</span>.</p>
-<p class="Pp">A new <code class="Nm">dhu</code> driver showed up in
- <span class="Ux">NetBSD 1.2</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">Even if the <code class="Nm">dhu</code> hardware supports DMA, the
- driver cannot make use of this capability.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">June 5, 1993</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>