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VESA Local Bus

The VESA Local Bus is a local bus defined by the Video Electronics Standards Association, mostly used in personal computers based on the Intel 80486 CPU. VESA Local Bus worked alongside the ISA bus; it acted as a high-speed conduit for memory-mapped I/O and DMA, while the ISA bus handled interrupts and port-mapped I/O.

The VESA Local Bus was was designed as a stop-gap solution to the problem of ISA's limited bandwidth, and had several flaws that limited its useful life substantially:

By 1996, the Pentium (driven by Intel's Triton chipset and Peripheral Component Interconnect (PCI) architecture) had all but eliminated the 80486 market, and VESA Local Bus with it; most of the last 80486 motherboards made have PCI slots in addition to (or completely replacing) the VESA Local Bus slots.

See also:

Article based based on VESA Local Bus at FOLDOC, used with permission.