Short for Extended Industry Standard Architecture,
EISA was announced September of 1988.
EISA is a computer bus designed by 9 competitors to compete with IBM's MCA BUS.
These competitors were AST Research, Compaq, Epson, Hewlett Packard, NEC, Olivetti, Tandy, WYSE, and Zenith Data Systems.
The EISA Bus provided 32-bit slots at an 8.33 MHz cycle rate for the use with 386DX, or higher processors. In addition the EISA can accommodate a 16-bit ISA card in the first row.
Unfortunately, while the EISA bus is backwards compatible and is not a proprietary bus the EISA bus never became widely used and is no longer found in computers today.