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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">
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<center>
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<p><br /></p>
<p>Moreover, because it uses an undocumented feature, the timer-stop approach could conceivably cause erratic 8253 operation, which could in turn seriously affect your computer&rsquo;s operation until the next reboot. In non-8253-compatible systems, I&rsquo;ve observed not only wildly incorrect timing results, but also failure of a diskette drive to operate properly after the long-period Zen timer with <b>PS2</b> set to 0 has run, so be alert for signs of trouble if you do set <b>PS2</b> to 0.</p>
<p>Rebooting should clear up any timer-related problems of the sort described above. (This gives us another reason to reboot at the end of each code-timing session.) You should <i>immediately</i> reboot and set the <b>PS2</b> equate to 1 if you get erratic or obviously incorrect results with the long-period Zen timer when <b>PS2</b> is set to 0. If you want to set <b>PS2</b> to 0, it would be a good idea to time a few of the listings in this book with <b>PS2</b> set first to 1 and then to 0, to make sure that the results match. If they&rsquo;re consistently different, you should set <b>PS2</b> to 1.</p>
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<p>As with the precision Zen timer, the program in Listing 3.6 is used by naming the file containing the code to be timed TESTCODE, then assembling both Listing 3.6 and Listing 3.5 with MASM or TASM and linking the two files together by way of the Microsoft or Borland linker. Listing 3.7 shows a batch file, named LZTIME.BAT, which does all of the above, generating and running the executable file LZTEST.EXE. LZTIME.BAT assumes that the file LZTIMER.ASM contains Listing 3.5 and the file LZTEST.ASM contains Listing 3.6.</p>
<p><br /></p>
<center>
<table border="1">
<tr>
<td><a href="03-07.html">Previous</a></td>
<td>
<a href="03-07.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="03-09.html">Next</a></td>
<td>
<a href="03-09.html">Next</a>
</td>
</tr>
</table>
</center>