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+<table class="head">
+ <tr>
+ <td class="head-ltitle">NMDM(4)</td>
+ <td class="head-vol">Device Drivers Manual</td>
+ <td class="head-rtitle">NMDM(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">nmdm</code> &#x2014; <span class="Nd">nullmodem
+ terminal driver</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp">To compile this driver into the kernel, place the following line
+ in your kernel configuration file:</p>
+<div class="Bd Pp Bd-indent"><code class="Cd">device nmdm</code></div>
+<p class="Pp">Alternatively, to load the driver as a module at boot time, place
+ the following line in <a class="Xr">loader.conf(5)</a>:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>nmdm_load=&quot;YES&quot;</pre>
+</div>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">nmdm</code> driver provides two
+ <a class="Xr">tty(4)</a> devices connected by a virtual &#x201C;null
+ modem&#x201D; cable.</p>
+<p class="Pp">If either of the two tty devices have the
+ <code class="Dv">CDSR_OFLOW</code> bit (&#x201C;<code class="Li">stty
+ dsrflow</code>&#x201D;) set in their line discipline, the
+ <code class="Nm">nmdm</code> device will emulate the speed configured in the
+ <a class="Xr">termios(4)</a> settings. The speed emulation works
+ independently in the two directions, controlled by the slower end's termios
+ settings (<var class="Va">c_ispeed</var>, <var class="Va">c_ospeed</var>,
+ <code class="Dv">CS5 ... CS8</code>, <code class="Dv">CSTOPB</code> and
+ <code class="Dv">PARENB</code>).</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/nmdm</span><var class="Ar">N</var>[<span class="Pa">AB</span>]</dt>
+ <dd>nullmodem device nodes. Where the <span class="Pa">A</span> node has a
+ matching <span class="Pa">B</span> node.</dd>
+</dl>
+<p class="Pp">The <code class="Nm">nmdm</code> driver implements
+ &#x201C;on-demand device creation&#x201D; so simply accessing a given
+ instance in <span class="Pa">/dev</span> will create it.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOSTICS</a></h1>
+<p class="Pp">None.</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">stty(1)</a>, <a class="Xr">termios(4)</a>,
+ <a class="Xr">tty(4)</a>, <a class="Xr">ttys(5)</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">nmdm</code> driver first appeared in
+ <span class="Ux">FreeBSD 4.4</span>.</p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">July 11, 2020</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>