High Quality Content by WIKIPEDIA articles! Industry Standard Architecture (ISA) is a computer bus standard for IBM PC compatible computers introduced with the IBM Personal Computer to support its Intel 8088 microprocessor`s 8-bit external data bus and extended to 16 bits for the IBM Personal Computer/AT`s Intel 80286 processor. The ISA bus was further extended for use with 32-bit processors as Extended Industry Standard Architecture (EISA). For general desktop computer use it has been supplanted by later buses such as IBM Micro Channel, VESA Local Bus, Peripheral Component Interconnect and other successors. A derivative of the AT bus structure is still used in the PC/104 bus, and internally within Super I/O chips.