VGA, XGA, WGA video card
Nowadays, a variety of input and output devices for video signals transferring are widely used in personal computers, projectors, digital video recorders, and laser compact disc players, etc. The video information of a PC is transferring to a display (i.e. a monitor) by means of an interface. The video card or video adapter provided with personal computers functions as a hardware interface with a display device. The video adapter deals with image data and outputs the video signal to a display device such as cathode ray tube (CRT) or liquid crystal display (LCD). Sometimes, the video adapter is incorporated into a motherboard by PC manufacturers to lower the overall cost as well as to improve reliability of the computer system. Typically, video adapter circuit boards generate red, green and blue (RGB) analog component video signals in addition to horizontal (HSYNC) and vertical (VSYNC) synchronizing signals. These signals are generally formatted according to a selected one of several commonly utilized computer scanning formats. These formats determine the resolution of the video image and include video graphics array (VGA), super video graphics array (SVGA), extended graphics adapter (EGA), color graphics adapter (CGA), and extended graphics array (XGA) formats. In the field of computer graphics, the prevailing standard is the VGA standard. A generic VGA card has fifteen pins, and each pin has a definition except for three spare pins. A VGA interface card is typically built around a VGA "chip set" that includes a number of complementary chips proven to work well together and that together realize all of the necessary functions to drive the display device.
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