ISA bus


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Related to ISA bus: PCI bus, MCA bus

ISA bus

ISA bus

(Industry Standard Architecture bus) A hardware interface for connecting peripheral devices in earlier PCs. Pronounced "eye-suh," ISA accepted plug-in cards for sound, display, hard drives and other connectivity. Originally called the "AT bus" and introduced with the IBM PC AT in 1984, the AT/ISA bus extended the PC bus from 8 to 16 bits. For several years, motherboards provided a mix of both 8-bit and 16-bit ISA slots. As PCI became popular, motherboards included only 16-bit ISA and PCI, and by the early 2000s, ISA was being replaced entirely by the PCI interface. See PC data buses and PCI.


ISA Slots
This diagram shows a motherboard with three 16-bit ISA slots.







Mixed ISA Slots
Earlier motherboards came with a mix of 8-bit (left) and 16-bit (right) slots such as this one.







Earlier Expansion Cards
Except for the PCI bus, ISA, AGP, EISA, Micro Channel and VL-bus have all but disappeared.
References in periodicals archive ?
The receiver module is mounted onto a full length ISA bus card and is interconnected to the card via a small D-connector cable.
The All-In-One Kit provides users with a 8-bit host adapter and device drivers for all popular operating systems and support for the connection of most important peripherals to an ISA bus.
Sealevel Systems, founded in 1986, provides communications and I/O solutions for multiple platforms including PCI Bus, ISA Bus, Ethernet serial servers, USB serial adapters, PCMCIA cards, and PC/104 modules.