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
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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>
<table border="1">
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<td><a href="29-03.html">Previous</a></td>
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<a href="29-03.html">Previous</a>
</td>
<td><a href="index.html">Table of Contents</a></td>
<td>
<a href="index.html">Table of Contents</a>
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<td><a href="29-05.html">Next</a></td>
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<p><br /></p>
<p>How does one go about setting the palette registers? Well, it&rsquo;s certainly possible to set the palette registers directly by addressing them at registers 0 through 0FH of the Attribute Controller. However, setting the palette registers is a bit tricky&mdash;bit 5 of the Attribute Controller Index register must be 0 while the palette registers are written to, and glitches can occur if the updating doesn&rsquo;t take place during the blanking interval&mdash;and besides, it turns out that there&rsquo;s no need at all to go straight to the hardware on this one. Conveniently, the EGA BIOS provides us with video function 10H, which supports setting either any one palette register or all 16 palette registers (and the overscan register as well) with a single video interrupt.</p>
<p>Video function 10H is invoked by performing an <b>INT</b> 10H with AH set to 10H. If AL is 0 (subfunction 0), then BL contains the number of the palette register to set, and BH contains the value to set that register to. If AL is 1 (subfunction 1), then BH contains the value to set the overscan (border) color to. Finally, if AL is 2 (subfunction 2), then ES:DX points to a 17-byte array containing the values to set palette registers 0-15 and the overscan register to. (For completeness, although it&rsquo;s unrelated to the palette registers, there is one more subfunction of video function 10H. If AL = 3 (subfunction 3), bit 0 of BL is set to 1 to cause bit 7 of text attributes to select blinking, or set to 0 to cause bit 7 of text attributes to select highreverse video.)</p>
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<p><br /></p>
<center>
<table border="1">
<tr>
<td><a href="29-03.html">Previous</a></td>
<td>
<a href="29-03.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="29-05.html">Next</a></td>
<td>
<a href="29-05.html">Next</a>
</td>
</tr>
</table>
</center>