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Retidy, removing align=left from headings and empty paragraphs

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James Gregory 2013-12-30 15:37:13 +11:00
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
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<center>
<table border="1">
<tr>
<td><a href="33-04.html">Previous</a></td>
<td>
<a href="33-04.html">Previous</a>
</td>
<td><a href="index.html">Table of Contents</a></td>
<td>
<a href="index.html">Table of Contents</a>
</td>
<td><a href="34-02.html">Next</a></td>
<td>
<a href="34-02.html">Next</a>
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</center>
<p><br /></p>
<h2 id="Heading1">Chapter 34<br />
Changing Colors without Writing Pixels</h2>
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<p>So we wait for the start of the vertical sync pulse, then begin to load the DAC. There&rsquo;s a catch, though. On many computers&mdash;Pentiums, 486s, and 386s sometimes, 286s most of the time, and 8088s all the time&mdash;there just isn&rsquo;t enough time between the start of the vertical sync pulse and the end of vertical blanking to load all 256 DAC locations. That&rsquo;s the crux of the problem with the DAC, and shortly we&rsquo;ll get to a tool that will let you explore for yourself the extent of the problem on computers in which you&rsquo;re interested. First, though, we must address <i>another</i> DAC loading problem: the BIOS.</p>
<p><br /></p>
<center>
<table border="1">
<tr>
<td><a href="33-04.html">Previous</a></td>
<td>
<a href="33-04.html">Previous</a>
</td>
<td><a href="index.html">Table of Contents</a></td>
<td>
<a href="index.html">Table of Contents</a>
</td>
<td><a href="34-02.html">Next</a></td>
<td>
<a href="34-02.html">Next</a>
</td>
</tr>
</table>
</center>