Industry Standard Architecture


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Related to Industry Standard Architecture: Micro Channel architecture, Eisa, XT bus architecture, AGP

Industry Standard Architecture

(architecture, standard)
(ISA) A bus standard for IBM compatibles that extends the XT bus architecture to 16 bits. It also allows for bus mastering although only the first 16 MB of main memory is available for direct access. In reference to the XT bus architecture it is sometimes referred to as "AT bus architecture".

Compare EISA, MCA.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

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.
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References in periodicals archive ?
LPC is a flexible 33MHz interface which will replace the earlier ISA (Industry Standard Architecture) bus in the majority of new PCs within the next year or two.
"A key component to an industry standard architecture is the broad ecosystem of support that is provided by leading tools and software vendors, giving design engineers a greater time-to-market opportunity.
The Zx10 visual workstation is a dual-processor capable Windows(r) OS-based workstation powered by SGI's innovative Wahoo Technology, which delivers unmatched system throughput and I/O bandwidth in an industry standard architecture. By fully optimizing processors, graphics, memory, and I/O subsystems, the Zx10 offers superior performance for all types of visual computing applications, including mechanical CAD, virtual sets, digital content creation, and visual simulation.
Millennium, which will use the Windows 9x kernel, due to be released next year, is unlikely to support legacy standards - principally the Industry Standard Architecture (ISA) bus - which is also a key aim of the Easy PC project.

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