ISA bus


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Related to ISA bus: PCI bus, MCA bus

ISA bus

ISA bus

(Industry Standard Architecture bus) An earlier hardware interface for connecting peripheral devices in PCs. Pronounced "eye-suh," ISA accepted cards for sound, display, hard drives and other devices. 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
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 disappeared.
References in periodicals archive ?
In addition, it provides high-bandwidth expansion capability with one PCI Express Mini Card for custom system configurations and one PC/104 for ISA bus. The CAPA112 supports Windows[R] 7, Windows[R] XP Embedded and Linux.
It wasn't long before it was generalized as a replacement for the aging 16-b ISA bus that had dominated early PCs.
The ISA bus interface is only 16-bit, while the EISA is 32-bit, so that the latter is generally more desirable.
Rancho Technology, Inc., has released a new 16-Bit Plug and Play SCSI host adapter for the ISA bus, the RT1600E.
Depending on application, features of controls include: electroluminescent or LCD operator displays, high-speed event detection for real-time response, high-density/high-power digital I/O, analog I/O, closed-loop control, alarm and fault detection and display, on-board diagnostics, Multibus or ISA bus architecture, 386 microprocessors, DOS platform, plotting and graphics, real-time clock, soft keys, printer output, and auxiliary-equipment interface.
This card, commonly referred to as an industry standard architecture or ISA bus card, provides the radio with power, controls the frequency at which the receiver operates and gives digital signal strength to the processor bus.
The PC/104 connector is a small form factor connector that implements a standard ISA bus with two dual rows of 0.1" pitch contacts.
In addition to ISA bus mastering, the unit supports five PCI bus masters and PCI-to-PCI bridging, and has the capacity to drive 20 slots of ISA.
Client connectivity options include a PCMCIA card for networking notebook computers as well as PCI and ISA bus adapters for desktop systems.