What is VGA?
VGA (Video Graphics Array) is the basic standard for color resolution in computer monitors, which today is the lowest common compatibility denominator. For example, when a computer is introduced to the Microsoft ™ Windows ™ operating system, the VGA start screen or the Windows logo is presented using a 32 -color palette and 640 x 480 resolution. Once the system has been fully loaded, the graphics card driver takes a higher resolution.
In the first days of computers, monitors were originally monochrome or two -color. This was followed by a color graphic adapter IBM (CGA) in 1981, which boasted with a 4 -bit 8 -color palette and a maximum resolution of 640 x 280. The adapter was standard in the new IBM PC line, known as IBM PC. Improved graphics adapter (ego) built on the previous standard by doubled color palette to 16 colors at 640 x 350.noduše "at". AT had specific motherboard technologies and configuration parameters that have become an ad-hoc standard for clones whose tracks and cases of motherboard were considered "ATS" because they adapted to the IBM standard.
In 1987, IMB introduced VGA, which manufacturers received in bulk. This has led to the long -term tradition of VGA is a "base" or "falling off" to display the standard of video hardware. Each modern graphics adapter or card is able to display the VGA mode, but does so only if the correct device driver is not present or cannot be placed; If he was intentionally deactivated; or if the operating system cannot find a better driver. In Windows operating systems, VGA displays the safe mode because unnecessary devices of the device are not loaded in this case.
IBM replaced VGA in 1990 XGA (extended graphics field) but to this DOBY Association Video Electronics Standards Association (Vesa) has released a similar standard known as Super VGA (SVGA). The XGA was capable of 65,536 colors at a resolution of 800 x 600, or 256 colors at 1024 x 768, similar to the early SVGA standards. This was followed by Super XGA (SXGA), Ultra XGA (UXGA) and Quad XGA (QXGA), along with many others.
The display standards have been developing quickly from this point forward with many grouped under the "SVGA" title. The taste of a wide -angle screen has "W" before the shortcut, such as "WXGA". Like graphics cards, they have maximum resolution, computer monitors. When buying a card or monitor, make sure that the highest standards of each device are compatible.