Misc/abrash-black-book
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Remove colour attributes from body and strip most of the font tags out

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James Gregory 2013-12-30 13:57:02 +11:00
commit c1f88ddb41
362 changed files with 1632 additions and 1706 deletions
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25-04.html
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<!--CHAPTER=25//-->
<!--PAGES=472-474//-->
<!--UNASSIGNED1//-->
<!--UNASSIGNED2//--></HEAD><BODY LINK=#0000FF ALINK=#000099 VLINK=#0000FF BGCOLOR=#FFFFFF>
<!--UNASSIGNED2//--></HEAD><body>
<CENTER>
<TABLE BORDER>
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</PRE>
<!-- END CODE //-->
<H4 ALIGN="LEFT"><A NAME="Heading6"></A><FONT COLOR="#000077">Setting All Planes to a Single Color</FONT></H4>
<H4 ALIGN="LEFT"><A NAME="Heading6"></A>Setting All Planes to a Single Color</H4>
<P>The set/reset circuitry can be used to force some planes to 0-bits and others to 1-bits during a single write, while letting CPU data go to still other planes, and so provides an efficient way to set all planes to a desired color. The set/reset circuitry works as follows:
</P>
<P>For each of the bits 0-3 in the Enable Set/Reset register (Graphics Controller register 1) that is 1, the corresponding bit in the Set/Reset register (GC register 0) is extended to a byte (0 or 0FFH) and replaces the CPU data for the corresponding plane. For each of the bits in the Enable Set/Reset register that is 0, the CPU data is used unchanged for that plane (normal operation). For example, if the Enable Set/Reset register is set to 01H and the Set/Reset register is set to 05H, then the CPU data is replaced for plane 0 only (the blue plane), and the value it is replaced with is 0FFH (bit 0 of the Set/Reset register extended to a byte). Note that in this case, bits 1-3 of the Set/Reset register have no effect.</P>
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<hr width="90%" size="1" noshade>
<div align="center">
<font face="Verdana,sans-serif" size="1">Graphics Programming Black Book &copy; 2001 Michael Abrash</font>
Graphics Programming Black Book &copy; 2001 Michael Abrash
</div>
<!-- all of the reference materials (books) have the footer and subfoot reveresed -->
<!-- reference_subfoot = footer -->