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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
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-<table class="head">
- <tr>
- <td class="head-ltitle">RF(4)</td>
- <td class="head-vol">Device Drivers Manual (vax)</td>
- <td class="head-rtitle">RF(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">rf</code> &#x2014; <span class="Nd">DEC RX01 /
- RX02 floppy disk 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">rfc0 at uba? csr 0177170 # RX01/RX02
- controller</code>
- <br/>
- <code class="Cd">rf* at rfc? drive? # RX01/RX02 floppy disk drive</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">rf</code> device provides access to DEC RX01
- and RX02 floppy disk drives and clones thereof. These drives use
- preformatted 8&quot; single sided, soft sectored media. The RX01 and RX02
- drives use a geometry of 77 cylinders, one head and 26 sectors. Each sector
- contains 128 bytes in case of single density ( RX01 and RX02 in RX01 mode)
- or 256 bytes in double density mode. As <span class="Ux">NetBSD</span> is
- not able to handle non-512 byte media the driver translates this to a
- geometry of 50 cylinders, one head and 10 sectors in single density and 77
- cylinders, one head and 13 sectors in double density mode. While the later
- matches the total number of sectors, the fake geometry in single density
- does not cover the last two physical sectors exact, but it is possible to
- access this sectors at 512 byte LBN 501. When a 512 byte block is written to
- LBN 501 the last 256 bytes are ignored. When this 512 byte block is read the
- last 256 bytes contain undefined data.</p>
-<p class="Pp">This driver supports three minor devices corresponding to the
- slices:</p>
-<table class="Bl-column Bd-indent">
- <tr id="Slice">
- <td><a class="permalink" href="#Slice"><b class="Sy">Slice</b></a></td>
- <td>Description</td>
- </tr>
- <tr>
- <td>a</td>
- <td>Single density only mode.</td>
- </tr>
- <tr>
- <td>b</td>
- <td>Double density only mode.</td>
- </tr>
- <tr>
- <td>c</td>
- <td>Density autodetect.</td>
- </tr>
-</table>
-As the RX01 and RX02 hardware is not able to support formatting a blank disk,
- this driver has no support for according IOCTLs. But there are clones from
- third party vendors that support formatting. Formatting a blank disk may be
- initiated by the following commands on the VAX chevron prompt:
-<table class="Bl-column Bd-indent">
- <tr>
- <td>Single density</td>
- </tr>
- <tr>
- <td>d/p/w 20001E78 9</td>
- </tr>
- <tr>
- <td>d/p/w 20001E7A 92</td>
- </tr>
-</table>
-<table class="Bl-column Bd-indent">
- <tr>
- <td>Double density</td>
- </tr>
- <tr>
- <td>d/p/w 20001E78 109</td>
- </tr>
- <tr>
- <td>d/p/w 20001E7A 92</td>
- </tr>
-</table>
-</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/rf?[abc]</span></dt>
- <dd style="width: auto;">&#x00A0;</dd>
- <dt><span class="Pa">/dev/rrf?[abc]</span></dt>
- <dd style="width: auto;">&#x00A0;</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOSTICS</a></h1>
-<dl class="Bl-diag">
- <dt>rfc_attach: Error creating bus_dma map: %d</dt>
- <dd></dd>
- <dt>did not respond to INIT CMD</dt>
- <dd>Possible errors during <a class="Xr">vax/autoconf(4)</a>. %d is the return
- code of <a class="Xr">bus_dmamap_create(9)</a>.</dd>
- <dt>%s: did not respond to CMD %x</dt>
- <dd>An error occurred while the driver tried to send command %x to drive
- %s.</dd>
- <dt>rfc_intr: Error while reading sector: %x</dt>
- <dd></dd>
- <dt>rfc_intr: Error while writing sector: %x</dt>
- <dd></dd>
- <dt>rfc_intr: Error while DMA: %x</dt>
- <dd>%x is status code from the controller error and status register.</dd>
- <dt>rfc_intr: Error while loading bus_dma map: %d</dt>
- <dd>%d is return code of <a class="Xr">bus_dmamap_load(9)</a>.</dd>
- <dt>%s: density error.</dt>
- <dd>A single density disk was opened in double density only mode or vice versa
- or the medium in the drive attached as %s was not readable at all.</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">dd(1)</a>, <a class="Xr">tar(1)</a>,
- <a class="Xr">vax/intro(4)</a>, <a class="Xr">disklabel(5)</a>,
- <a class="Xr">disklabel(8)</a>, <a class="Xr">mknod(8)</a>,
- <a class="Xr">mount(8)</a>, <a class="Xr">newfs(8)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The rf driver appeared in <span class="Ux">NetBSD 2.0</span>. It
- is a complete rewrite, not related to the old 4.2BSD
- <code class="Nm">rx</code> driver.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp"><span class="An">Jochen Kunz</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">Writing of a <a class="Xr">disklabel(5)</a> is not supported. The
- driver return always the internally fake disklabel.</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>