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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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CertiGuide to A+ (A+ 4 Real) (http://www.CertiGuide.com/apfr/) on CertiGuide.com
Version 1.0 - Version Date: March 29, 2005
Adapted with permission from a work created by Tcat Houser et al.
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