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+<table class="head">
+  <tr>
+    <td class="head-ltitle">ISV(4)</td>
+    <td class="head-vol">Device Drivers Manual</td>
+    <td class="head-rtitle">ISV(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">isv</code> &#x2014; <span class="Nd">IDEC
+    Supervision/16 image capture board</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">isv0 at isa? port 0x2f0</code>
+  <br/>
+  <code class="Cd">isv0 at isa? port 0x2e0</code>
+  <br/>
+  <code class="Cd">isv0 at isa? port 0x3f0</code>
+  <br/>
+  <code class="Cd">isv0 at isa? port 0x3e0</code></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp"><code class="Nm">isv</code> is a driver for the IDEC
+    Supervision/16, an image capture board that plugs into a 16-bit ISA bus. The
+    IDEC Supervision/16 digitizes an NTSC television signal, storing a 512 x
+    480-pixel, 8-bit grayscale image in its 256kB dynamic RAM array every 1/30th
+    of a second. The host reads frames from the DRAM using 122881 16-bit I/O
+    reads. Reading frames from the Supervision/16 is quite slow: after the host
+    reads a 16-bit word from the DRAM, the Supervision/16 state machine takes
+    approximately 0.5 microseconds to get ready for the next read.
+    Theoretically, a frame rate of approximately 10 frames per second is
+    possible. <code class="Nm">isv</code> achieves a frame rate of approximately
+    6 frames per second.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
+  ALSO</a></h1>
+<p class="Pp"><cite class="Rs"><span class="RsR">Programming the Supervision/16
+    Image Capture Board</span>, <span class="RsQ">IDEC</span>,
+    <span class="RsD">circa 1991</span>.</cite></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">isv</code> device first appeared in
+    <span class="Ux">NetBSD 5.0</span>.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
+<p class="Pp">The <code class="Nm">isv</code> driver was written by
+    <span class="An">David Young</span>
+    &lt;<a class="Mt" href="mailto:dyoung@NetBSD.org">dyoung@NetBSD.org</a>&gt;.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
+<p class="Pp">Synchronizing with the hardware and reading frames from it is very
+    CPU-intensive.</p>
+<p class="Pp"><code class="Nm">isv</code> will not detect the capture board if
+    it is not attached to an active video source. To force
+    <span class="Ux">NetBSD</span> to detect the capture board at any time,
+    re-scan the ISA bus using, e.g., <code class="Ic">drvctl</code>
+    <code class="Fl">-r</code> <var class="Ar">isa0</var>.</p>
+</section>
+</div>
+<table class="foot">
+  <tr>
+    <td class="foot-date">April 1, 2008</td>
+    <td class="foot-os">NetBSD 10.1</td>
+  </tr>
+</table>