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It should be becoming readily apparent
the statement made earlier about video cards being "mini-computers inside
your PC," is beginning to take shape.
Like PCs, video cards
have their own BIOS programs that control
the interface of the video chipset and video
Of course BIOS programs are simpler
versions of the ROM BIOS found on your motherboard,
as it only needs a set of instructions related
specifically to video functions.
Like BIOS programs found on motherboards,
video BIOS programs can differ on different
video cards that use the same chipset.
In fact many video
cards differ primarily in software, with not
much difference in hardware.
Video Electronics Standards Association (VESA)
Because of the overwhelming number of different video card technologies, chipsets, and video BIOS programs, programming software to make use of these advancements became difficult very quickly. The Video Electronics Standard Association, VESA, introduced a standard for high resolution BIOS code called the VESA BIOS Extensions, or VBE. These extensions can be implemented in either hardware or software drivers and allow a more standard method of controlling video output.
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CertiGuide to A+ (Core Hardware) (http://www.CertiGuide.com/aplush/) on CertiGuide.com
Version 1.0 - Version Date: December 6, 2004
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