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<table class="head">
<tr>
<td class="head-ltitle">DMZ(4)</td>
<td class="head-vol">Device Drivers Manual (vax)</td>
<td class="head-rtitle">DMZ(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">dmz</code> — <span class="Nd">DMZ-32
serial terminal multiplexor</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">dmz0 at uba? csr 0160540 vector dmzrinta dmzxinta
dmzrintb dmzxintb dmzrintc dmzxintc</code></p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<p class="Pp">NOTE: This driver has not been ported from
<span class="Ux">4.4BSD</span> yet.</p>
<p class="Pp">The <code class="Nm">dmz</code> device provides 24 lines of
asynchronous serial line support. Modem control on all ports is available as
an option for the H3014 distribution panel.</p>
<p class="Pp">An optional argument <var class="Ar">flags</var> may be supplied
with the device specification for <code class="Nm">dmz</code> in the config
file indicating that the line corresponding to bit number
<var class="Ar">i</var> is not properly connected, and should be treated as
hard-wired with carrier always present. Thus specifying
‘<code class="Li">flags 0x000004</code>’ for
<code class="Li">dmz0</code> would cause line <span class="Pa">ttya2</span>
to be treated in this way.</p>
<p class="Pp">Normal I/O control parameters for individual lines are managed by
<a class="Xr">ioctl(2)</a> calls. Line speeds (there are 16 choices for the
DMZ) may be initiated via <a class="Xr">getty(8)</a> and
<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 <code class="Nm">dmz</code> driver normally enables the input
silos with a short timeout (30 milliseconds); this allows multiple
characters to be received per interrupt during periods of high-speed
input.</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[abcefg][0-9a-n]</span></dt>
<dd style="width: auto;"> </dd>
</dl>
</section>
<section class="Sh">
<h1 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOSTICS</a></h1>
<dl class="Bl-diag">
<dt>dmz%d: NXM line %d.</dt>
<dd>No response from the UNIBUS on a DMA transfer within a timeout period.
This is often followed by a UNIBUS adapter error. This occurs most
frequently when the UNIBUS is heavily loaded and when devices which hog
the bus (such as RK07s) are present. It is not serious.</dd>
<dt>dmz%d: silo overflow.</dt>
<dd>The character input silo overflowed before it could be serviced. This can
happen if a hard error occurs when the CPU is running with elevated
priority, as the system will then print a message on the console with
interrupts disabled. It is not serious.</dd>
</dl>
</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">dmz</code> driver appeared in
<span class="Ux">4.3BSD</span>.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
<p class="Pp">It should be possible to set the silo timeout with a configuration
file option, as the value is a trade-off between efficiency and response
time for flow control and character echo.</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>
|
