![]() On that day, in fact, IBM also introduced the lower-resolution MCGA and higher-resolution 8514 adapters. When IBM introduced the PS/2 systems on April 2, 1987, it also introduced the VGA display. If you are interested in reading more about MDA, HGC, CGA, EGA, or MCGA display adapters, see Chapter 8 of Upgrading and Repairing PCs, 10th Anniversary Edition, included on the disc with this book. Obsolete Display AdaptersĪlthough many types of display systems were at one time considered to be industry standards, few of these are viable standards for today's hardware and software. Although not a concern for most users, some older programs wrote directly to hardware registers that are no longer found on current video cards. This enables you to use older graphics software (such as games and educational programs) on your current system. Today's VGA and later video adapters can also display most older color graphics software written for CGA, EGA, and most other obsolete graphics standards. However, reading about these standards gives you a good idea of how video-display technology developed over the years and prepares you for any close encounters you might have with legacy equipment from the dark ages. When you shop for a video adapter today, you are more likely to see specific references to the screen resolutions and color depths that the device supports than a list of standards such as VGA, SVGA, XGA, and UVGA. The sole exception to this is VGA, which is a term that is still used to refer to a baseline graphics display capability supported by virtually every video adapter on the market today. Those that aren't obsolete seldom are referred to by these names anymore. Today, IBM no longer sets standards for the PC business (it even sold its PC business to China's Lenovo in 2005), and many of these standards are obsolete. IBM pioneered most of these standards, but other manufacturers of compatible PCs adopted them as well. The following list of standards can serve as an abbreviated history of PC video-display technology: Throughout the history of the PC, there have been a succession of standards for video display characteristics that represent a steady increase in screen resolution and color depth. A video adapter provides the interface between your computer and your monitor and transmits the signals that appear as images on the display. ![]()
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