VESA Local Bus (VL)
VESA Local Bus (VL) – In late 1992, VESA (Video Electronics Standard Association) completed the specification for a local bus expansion for PCs. One of the most important things about VL Bus design is that it specified connector pinout. The VL Bus, considered a high-speed bus with a maximum speed of 66 MHz, was designed with the Intel 486 in mind. The 32- bit bus, which includes unbuffered control, data, and address signals is compatible with 16-bit operations. One drawback of the VL Bus implementation is that the more expansion connectors used, the slower the operation of the bus. For example, using two connectors, the highest recommended speed is 40 MHz. When multiple bus slots are desired, multiple VL Bus subsystems can be built into a single PC.
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