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<table class="head">
<tr>
<td class="head-ltitle">DMC(4)</td>
<td class="head-vol">Device Drivers Manual (vax)</td>
<td class="head-rtitle">DMC(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">dmc</code> — <span class="Nd">DEC
DMC-11/DMR-11 point-to-point serial communications device</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">dmc0 at uba0 csr 167600</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">dmc</code> interface provides access to a
point-to-point communications device which runs at either 1 Mb/s or 56 Kb/s.
DMC-11s communicate using the DEC DDCMP link layer protocol.</p>
<p class="Pp">The <code class="Nm">dmc</code> interface driver also supports a
DEC DMR-11 providing point-to-point communication running at data rates from
2.4 Kb/s to 1 Mb/s. DMR-11s are a more recent design and thus are preferred
over DMC-11s. The <code class="Dv">NXMT</code> and
<code class="Dv">NRCV</code> constants in the driver may be increased in
this case, as the DMR can accept up to 64 transmit and receive buffers, as
opposed to 7 for the DMC.</p>
<p class="Pp">The configuration flags specify how to set up the device,</p>
<table class="Bl-column Bd-indent">
<tr>
<td>0</td>
<td>full duplex DDCMP (normal mode)</td>
</tr>
<tr>
<td>1</td>
<td>DDCMP Maintenance mode (generally useless)</td>
</tr>
<tr>
<td>2</td>
<td>DDCMP Half Duplex, primary station</td>
</tr>
<tr>
<td>3</td>
<td>DDCMP Half Duplex, secondary station</td>
</tr>
</table>
The host's address must be specified with an <code class="Dv">SIOCSIFADDR</code>
<a class="Xr">ioctl(2)</a>, and the destination address specified with a
<code class="Dv">SIOCSIFDSTADDR</code> <a class="Xr">ioctl(2)</a>, before the
interface will transmit or receive any packets.
</section>
<section class="Sh">
<h1 class="Sh" id="ROUTING"><a class="permalink" href="#ROUTING">ROUTING</a></h1>
<p class="Pp">The driver places a HOST entry in the kernel routing tables for
the address given in the <code class="Dv">SIOCSIFDSTADDR</code>
<a class="Xr">ioctl(2)</a>. To use the DMC as a link between local nets, the
route to the remote net must be added manually with the
<a class="Xr">route(8)</a> command, or by the use of the routing process
<a class="Xr">routed(8)</a> on each end of the link.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOSTICS</a></h1>
<dl class="Bl-diag">
<dt id="dmcload">dmc%d: bad control %o.</dt>
<dd>A bad parameter was passed to the
<a class="permalink" href="#dmcload"><i class="Em">dmcload</i></a>
routine.</dd>
<dt>dmc%d: unknown address type %d.</dt>
<dd>An input packet was received which contained a type of address unknown to
the driver.</dd>
<dt>DMC fatal error 0%o.</dt>
<dd>A fatal error in DDMCP occurred, causing the device to be restarted.</dd>
<dt>DMC soft error 0%o.</dt>
<dd>A non-fatal error in DDMCP has occurred.</dd>
<dt>dmc%d: af%d not supported.</dt>
<dd>The interface was handed a message which has addresses formatted in an
unsuitable address family.</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">inet(4)</a>, <a class="Xr">vax/intro(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">dmc</code> driver appeared in
<span class="Ux">4.2BSD</span>.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
<p class="Pp">The current version of the driver uses a link-level encapsulation
so that multiple protocol types may be used. It is thus incompatible with
earlier drivers, including the <span class="Ux">4.2BSD</span> version.</p>
</section>
</div>
<table class="foot">
<tr>
<td class="foot-date">February 17, 2017</td>
<td class="foot-os">NetBSD 10.1</td>
</tr>
</table>
|
