Misc/abrash-black-book
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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
commit a96a114403
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11-04.html
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@ -1,5 +1,4 @@
<!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>
@ -19,17 +18,21 @@
<center>
<table border="1">
<tr>
<td><a href="11-03.html">Previous</a></td>
<td>
<a href="11-03.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="11-05.html">Next</a></td>
<td>
<a href="11-05.html">Next</a>
</td>
</tr>
</table>
</center>
<p><br /></p>
<p>When I was developing the Zen timer, I used my trusty 10 MHz 286-based AT clone to verify the basic functionality of the timer by measuring the performance of simple instruction sequences. I was cruising along with no problems until I timed the following code:</p>
<pre>
@ -115,16 +118,20 @@ FindChar proc near
<p>The two ways of looking at the display adapter cycle-eater on 286/386 computers are actually the same. As you&rsquo;ll recall from my earlier discussion of the matter in Chapter 4, display adapters offer only a limited number of accesses to display memory during any given period of time. The 8088 is capable of making use of most but not all of those slots with <b>REP MOVSW</b>, so the number of memory accesses allowed by a display adapter such as a standard VGA is reasonably well-matched to an 8088&rsquo;s memory access speed. Granted, access to a VGA slows the 8088 down considerably&mdash;but, as we&rsquo;re about to find out, &ldquo;considerably&rdquo; is a relative term. What a VGA does to PC performance is nothing compared to what it does to faster computers.</p>
<p><br /></p>
<center>
<table border="1">
<tr>
<td><a href="11-03.html">Previous</a></td>
<td>
<a href="11-03.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="11-05.html">Next</a></td>
<td>
<a href="11-05.html">Next</a>
</td>
</tr>
</table>
</center>