VGA and its significance

VGA is a term referring to Video Graphics Array that particularly displays hardware which was introduced with IBM PS/2 line of computers during the year 1987. Its extensive adoption has become either an analog computer display standard, the 640×480 resolution itself or a 15 pin D subminiature VGA connector. Even though this 640×480 resolution has been outdated in the personal computer market, it is become a well-liked resolution on mobile devices. The VGA was the last graphical standard which was introduced by IBM, later on many other PC clone manufacturers conformed to it and made it presently the lowest common denominator which any PC graphics hardware supports, prior to a device specific driver loaded in the computer.  VGA is also referred to as an “array” in lieu of an “adapter”  since it was implemented from the beginning as a single chip (an Asic) replacing the Motorola 6845 and many other logic chips which covered the full-length ISA boards of the CGA, MDA and EGA.  Its single-chip implementation allowed the VGA to be directly placed on a PC’s motherboard with least difficulty and minimum requirements of video memory, an external RAMDAC and timing crystals. It is basically a standard monitor or display interface utilized in majority of the PCs and thus if a monitor is VGA compatible it must be able to work with the new computers. The VGA standard resolution is 640×480 pixels and since then, a lot of updgradations have been introduced with the most common being Super VGA (SVGA). VGA allows resolution greater than 640×480 pixels like 800×600 or 1024×768.

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