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James Gregory 2013-12-30 15:11:04 +11:00
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<meta name="vspubdate" content="07/01/97" />
<meta name="vscategory" content="Web and Software Development: Game Development,Web and Software Development: Graphics and Multimedia Development" />
<title>Michael Abrash's Graphics Programming Black Book Special Edition: Reading VGA Memory</title><!-- HEADER -->
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<!--TITLE=Michael Abrash's Graphics Programming Black Book Special Edition//-->
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<title>Michael Abrash's Graphics Programming Black Book Special Edition: Reading VGA Memory</title>
<meta name="chapter" content="28" />
<meta name="pages" content="523-526" />
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<p><br /></p>
<h2><a id="Heading1"></a>Chapter 28<br />
<h2 id="Heading1">Chapter 28<br />
Reading VGA Memory</h2>
<h3><a id="Heading2"></a>Read Modes 0 and 1, and the Color Don&rsquo;t Care Register</h3>
<h3 id="Heading2">Read Modes 0 and 1, and the Color Don&rsquo;t Care Register</h3>
<p>Well, it&rsquo;s taken five chapters, but we&rsquo;ve finally covered the data write path and all four write modes of the VGA. Now it&rsquo;s time to tackle the VGA&rsquo;s two read modes. While the read modes aren&rsquo;t as complex as the write modes, they&rsquo;re nothing to sneeze at. In particular, read mode 1 (also known as color compare mode) is rather unusual and not at all intuitive.</p>
<p>You may well ask, isn&rsquo;t <i>anything</i> about programming the VGA straightforward? Well...no. But then, clearing up the mysteries of VGA programming is what this part of the book is all about, so let&rsquo;s get started.</p>
<h3><a id="Heading3"></a>Read Mode 0</h3>
<h3 id="Heading3">Read Mode 0</h3>
<p>Read mode 0 is actually relatively uncomplicated, given that you understand the four-plane nature of the VGA. (If you don&rsquo;t understand the four-plane nature of the VGA, I strongly urge you to read Chapters 23-27 before continuing with this chapter.) Read mode 0, the read mode counterpart of write mode 0, lets you read from one (and only one) plane of VGA memory at any one time.</p>
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<div align="center">
Graphics Programming Black Book &copy; 2001 Michael Abrash
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