What Is An ISA And An EISA?

ISA is a standard for I/O buses that was set back in 1984. Since IBM was the standard for computers, the bus in the AT became known as Industry Standard Architecture, or ISA. The ISA bus can only handle 16-bit data transfers at a clock speed of 8 MHz. It is also only capable of handling memory under 16 MB.

EISA, or Extended ISA, is an improvement over the ISA bus. It still runs at only 8 MHz, but is capable of 32-bit data transfer and can access all memory in the system.

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