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Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 8: Motherboards

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VESA VL Bus

VESA stands for Video Electronics Standards Association. This consortium of vendors developed a specific bus for video transfers in response to the increasing demand placed on video processing by the newly introduced Microsoft Windows GUI (Graphical User Interface). Windows GUI required 16-bit data transfers and the 8-bit ISA bus was unable to accommodate. Even the 16-bit, 7 MHz ISA video cards were unable to meet the demand of the GUI requirements. The VESA VL Bus allowed the other devices on the motherboard to tap directly into it, allowing 32 bit CPUs such as the Intel 386 and 486 to process the increased video data. The VL Bus had a top transfer rate of 33 MHz and presented a workable and inexpensive answer to the shortcomings of the ISA bus. The VL Bus became obsolete when Intel developed the first 64-bit Pentium processor.


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