static/netbsd/man4/man4.mac68k/iwm.4 3.html


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<table class="head">
  <tr>
    <td class="head-ltitle">IWM(4)</td>
    <td class="head-vol">Device Drivers Manual (mac68k)</td>
    <td class="head-rtitle">IWM(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">iwm</code>, <code class="Nm">fd</code> &#x2014;
    <span class="Nd">floppy disk driver for IWM and non-DMA SWIM
    controllers</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">iwm0 at obio?</code>
  <br/>
  <code class="Cd">fd* at iwm0 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">iwm</code> driver interfaces to the built-in
    and external floppy disk drives on the Macintosh. It supports double-density
    media, written in Apple's proprietary GCR format. Currently, there is no
    disklabel support for the floppy drives. Instead, the
    <code class="Nm">iwm</code> driver sets up a fake in-core disklabel, using
    the minor device number to select from the supported disk formats.</p>
<p class="Pp">The following formats are supported:</p>
<table class="Bl-column">
  <tr id="Partition">
    <td><a class="permalink" href="#Partition"><b class="Sy">Partition</b></a></td>
    <td><a class="permalink" href="#Size"><b class="Sy" id="Size">Size</b></a></td>
    <td><a class="permalink" href="#sides"><b class="Sy" id="sides">sides</b></a></td>
    <td><a class="permalink" href="#tracks"><b class="Sy" id="tracks">tracks</b></a></td>
    <td><a class="permalink" href="#sectors/track"><b class="Sy" id="sectors/track">sectors/track</b></a></td>
  </tr>
  <tr>
    <td>a</td>
    <td>800Kb</td>
    <td>2</td>
    <td>80</td>
    <td>10 (default)</td>
  </tr>
  <tr>
    <td>b</td>
    <td>400Kb</td>
    <td>1</td>
    <td>80</td>
    <td>10</td>
  </tr>
  <tr>
    <td>c</td>
    <td>800Kb</td>
    <td>2</td>
    <td>80</td>
    <td>10</td>
  </tr>
</table>
<p class="Pp">(The above table describes the logical mapping as implemented by
    the driver; the physical layout of GCR floppies has 8..12 sectors per
    track.)</p>
</section>
<section class="Sh">
<h1 class="Sh" id="FORMATTING"><a class="permalink" href="#FORMATTING">FORMATTING</a></h1>
<p class="Pp">The <code class="Nm">iwm</code> driver does currently not support
    floppy disk formatting.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
  ALSO</a></h1>
<p class="Pp">Apple Computer, Inc.: &quot;Inside Macintosh&quot;, Vol III-33f.
    (Addison-Wesley)</p>
<p class="Pp">Apple Computer, Inc.: &quot;New Technical Notes DV 17 - Sony
    Driver&quot;</p>
<p class="Pp">Neil Parker: &quot;iwmstuff&quot;</p>
<p class="Pp"><a class="Xr">eject(1)</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">iwm</code> interface first appeared in
    <span class="Ux">NetBSD 1.4</span>.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
<p class="Pp">Hauke Fath put together the beginnings of the
    <code class="Nm">iwm</code> driver in 1996 from the sparse documentation in
    &quot;Inside Macintosh&quot;, Neil Parker's &quot;iwmstuff&quot;
    documentation for the Apple IIgs and a long, hard look at the .Sony
  driver.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
<p class="Pp">The FFS code is incapable of dealing with a varying number of
    sectors per track. We have to fake a mapping and so lose FFS support for
    hardware parameters like transition times.</p>
<p class="Pp">The driver only supports an obsolete format.</p>
</section>
</div>
<table class="foot">
  <tr>
    <td class="foot-date">June 6, 1998</td>
    <td class="foot-os">NetBSD 10.1</td>
  </tr>
</table>