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 ?
past, the audio subsystem's reliance on the ISA bus prevented Wavetable
If individual high-current draw boards short out, the ISA Bus backplane prevents the entire system from failing.
A simple-to-use expansion card for adding Type I, II or III PC Card functionality (I/O or Memory) to an embedded computer, this new board integrates an XT/AT PC Card slot together with an Intel(R) PCMCIA to ISA bus controller fully compatible with PCMCIA V2.
The new adapter offers portable computer users data throughput that equals ISA bus to SCSI adapters used for desktop computers.
Sealevel Systems, founded in 1986, provides communications and I/O solutions based on Ethernet serial servers and serial adapters for PCI bus, ISA bus, and PCMCIA platforms.
The ETHERCHIP/SCEC integrates an Ethernet compatible controller, Memory Management Unit (MMU), high speed ISA bus interface, encoder and decoder, 10BASE-T transceiver, and an AUI interface on a single chip.