Programmer's Guide to EGA & VGA Cards
A programmer can achieve a high level of video compatibility by supporting basic VGA and EGA cards in software development. Such compatibility helps to ensure that a wide range of computers will run the software in question.
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EGA Guide
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DOS and early releases of Windows support EGA video. According to Microsoft, Windows supported it through version 3.11. The booklet "MS-DOS/GW-BASIC Enhancements" indicates that EGA cards can operate at resolutions of 320x200, 640x200, and 640x350. They also expand text-only mode to 64 colors.
VGA Guide
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Most PC operating systems support basic VGA cards. In addition to the CGA and EGA modes, they include 640x480 resolution and a 320x200 mode with more colors than the EGA equivalent. A programmer can identify 16-color 640x480 VGA as mode 12h, according to the University of Maryland, Baltimore County.
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Other Facts
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The special EGA and VGA screen modes start at number seven and end at 13 (10 for EGA). Graphical user interfaces such as Windows typically require the programmer to invoke full-screen mode before using 320x200 resolution. All VGA cards can display 256 colors at 320x200 pixels.
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References
Resources
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