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   <h2 id="Heading1">Chapter 47<br />
   Mode X: 256-Color VGA Magic</h2>
 
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   <p>Although some developers have taken advantage of Mode X, its use is certainly not universal, being entirely undocumented; only an experienced VGA programmer would have the slightest inkling that it even exists, and figuring out how to make it perform beyond the write pixel/read pixel level is no mean feat. Little other than my <i>DDJ</i> columns has been published about it, although John Bridges has widely distributed his code for a number of undocumented 256-color resolutions, and I&rsquo;d like to acknowledge the influence of his code on the mode set routine presented in this chapter.</p>
 
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