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EISA (Enhanced Industry Standard Architecture) - Definition

EISA is an abbreviation for Enhanced Industry Standard Architecture. It is a type of computer bus architecture for x86-based computers. An EISA device uses cards that are upwardly compatible from ISA. EISA extends the 16 bit PC AT expansion bus to 32 bits and supports a 32 bit data interface while maintaining compatibility with existing 16 bit cards. Unfortunately, the EISA bus runs only at 8.25 MHz and created high latency in small transfers, which lead to poor video performance compared to the 32 bit, 33 MHz VESA Local bus. Later the PCI local bus filled this niche causing EISA to vanish into obscurity.


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