Developed by AST and Compaq, these special connectors accomodate 8- and 16-bit ISA cards, and also they allow the user
to plug in special EISA 32-bit adapter cards. A 2-level card-edge connector allows ISA cards to be pressed down into the
first level of the connector, while EISA cards are designed to be inserted even further down into the connector, allowing the
card to access the 32-bit data lines at the bottom of the connector. Special 32-bit EISA cards were manufactured by a limited
number of companies, and the cost of EISA devices (such as drive controllers, video cards, etc.) were rather high. EISAbased
motherboards and adapter cards saw limited use in the PC world, and EISA systems were used as network file servers
and other kinds of high-performance systems (CAD, graphics development).

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