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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: Be It Resolved: 360x480</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: Be It Resolved: 360x480</title>
<meta name="chapter" content="32" />
<meta name="pages" content="607-611" />
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<p><br /></p>
<h2><a id="Heading1"></a>Chapter 32<br />
<h2 id="Heading1">Chapter 32<br />
Be It Resolved: 360x480</h2>
<h3><a id="Heading2"></a>Taking 256-Color Modes About as Far as the Standard VGA Can Take Them</h3>
<h3 id="Heading2">Taking 256-Color Modes About as Far as the Standard VGA Can Take Them</h3>
<p>In the last chapter, we learned how to coax 320x400 256-color resolution out of a standard VGA. At the time, I noted that the VGA was actually capable of supporting 256-color resolutions as high as 360x480, but didn&rsquo;t pursue the topic further, preferring to concentrate on the versatile and easy-to-set 320x400 256-color mode instead.</p>
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<p>In this chapter, I&rsquo;m going to combine John&rsquo;s mode set code with appropriately modified versions of the dot-plot code from Chapter 31 and the line-drawing code that we&rsquo;ll develop in Chapter 35. Together, those routines will make a pretty nifty demo of the capabilities of 360x480 256-color mode.</p>
<h3><a id="Heading3"></a>Extended 256-Color Modes: What&rsquo;s Not to Like?</h3>
<h3 id="Heading3">Extended 256-Color Modes: What&rsquo;s Not to Like?</h3>
<p>When last we left 256-color programming, we had found that the standard 256-color mode, mode 13H, which officially offers 320x200 resolution, actually displays 400, not 200, scan lines, with line-doubling used to reduce the effective resolution to 320x200. By tweaking a few of the VGA&rsquo;s mode registers, we converted mode 13H to a true 320x400 256-color mode. As an added bonus, that 320x400 mode supports two graphics pages, a distinct improvement over the single graphics page supported by mode 13H. (We also learned how to get <i>four</i> graphics pages at 320x200 resolution, should that be needed.)</p>
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<p>In other words, 360x480 256-color mode is worth considering&mdash;so let&rsquo;s have a look.</p>
<h3><a id="Heading4"></a>360x480 256-Color Mode</h3>
<h3 id="Heading4">360x480 256-Color Mode</h3>
<p>I&rsquo;m going to start by showing you 360x480 256-color mode in action, after which we&rsquo;ll look at how it works. I suspect that once you see what this mode looks like, you&rsquo;ll be more than eager to learn how to use it.</p>
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<div align="center">
Graphics Programming Black Book &copy; 2001 Michael Abrash
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