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-<table class="head">
- <tr>
- <td class="head-ltitle">RTFPS(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">RTFPS(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">rtfps</code> &#x2014;
- <span class="Nd">multiplexing serial communications interface</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">rtfps0 at isa? port 0x1230 irq 10</code>
- <br/>
- <code class="Cd">com2 at rtfps0 slave 0</code>
- <br/>
- <code class="Cd">com3 at rtfps0 slave 1</code>
- <br/>
- <code class="Cd">com4 at rtfps0 slave 2</code>
- <br/>
- <code class="Cd">com5 at rtfps0 slave 3</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">rtfps</code> driver provides support for IBM
- RT PC boards that multiplex together up to four EIA RS-232C (CCITT V.28) or
- RS-422A communications interfaces.</p>
-<p class="Pp">Each <code class="Nm">rtfps</code> device is the master device for
- up to four <code class="Nm">com</code> devices. The kernel configuration
- specifies these <code class="Nm">com</code> devices as slave devices of the
- <code class="Nm">rtfps</code> device, as shown in the synopsis. The port
- specification for the <code class="Nm">rtfps</code> device is used to
- compute the base addresses for the <code class="Nm">com</code>
- subdevices.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="FILES"><a class="permalink" href="#FILES">FILES</a></h1>
-<dl class="Bl-tag">
- <dt><span class="Pa">/dev/tty0?</span></dt>
- <dd style="width: auto;">&#x00A0;</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">com(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">rtfps</code> driver was written by Charles
- Hannum, based on the <code class="Nm">ast</code> driver.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">The <code class="Nm">rtfps</code> driver is unlikely to work on
- non-EISA and non-PCI machines. The ISA bus only asserts 10 I/O address
- lines, and this is not enough.</p>
-<p class="Pp">Even on EISA and PCI machines, some address conflicts have been
- observed. On one machine, the second port always conflicted with something
- (though it's not clear what) and caused strange results. Disabling the
- second port in the kernel config allowed the other three ports to function
- correctly.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">August 7, 1994</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>