Industry Standard Architecture

One 8-bit and five 16-bit ISA slots on a motherboard
8-bit XT, 16-bit ISA, EISA (top to bottom)
8-bit XT: Adlib FM Sound card
16-bit ISA: Madge 4/16 Mbps Token Ring NIC
16-bit ISA: Ethernet 10Base-5/2 NIC
8-bit XT: US Robotics 56k Modem

16-bit internal bus of IBM PC/AT and similar computers based on the Intel 80286 and its immediate successors during the 1980s.

- Industry Standard Architecture
One 8-bit and five 16-bit ISA slots on a motherboard

30 related topics

Alpha

A PCI-104 single-board computer.

PC/104

Family of embedded computer standards which define both form factors and computer buses by the PC/104 Consortium.

Family of embedded computer standards which define both form factors and computer buses by the PC/104 Consortium.

A PCI-104 single-board computer.

Its name derives from the 104 pins on the interboard connector (ISA) in the original PC/104 specification and has been retained in subsequent revisions, despite changes to connectors.

An Amiga 4000 desktop

Amiga 4000

Successor of the A2000 and A3000 computers.

Successor of the A2000 and A3000 computers.

An Amiga 4000 desktop
Amiga 4000 with case open
Amiga A3200/A3400 CPU card

The three ISA slots can be activated by use of a bridgeboard, which connects the Zorro and ISA buses.

Intel i945GC Northbridge with Intel Pentium Dual-Core E2220 2.40 GHz on a Intel D945GCCR motherboard (circa 2007)

Chipset

Set of electronic components in one or more integrated circuits known as a "Data Flow Management System" that manages the data flow between the processor, memory and peripherals.

Set of electronic components in one or more integrated circuits known as a "Data Flow Management System" that manages the data flow between the processor, memory and peripherals.

Intel i945GC Northbridge with Intel Pentium Dual-Core E2220 2.40 GHz on a Intel D945GCCR motherboard (circa 2007)
Diagram of Commodore Amiga's Original Chip Set
A part of an IBM T42 laptop motherboard. CPU: Central processing unit. NB: Northbridge. GPU: Graphics processing unit. SB: Southbridge.

The northbridge links the CPU to very high-speed devices, especially RAM and graphics controllers, and the southbridge connects to lower-speed peripheral buses (such as PCI or ISA).

IBM System/23 Datamaster

Announced by IBM in July 1981.

Announced by IBM in July 1981.

The PC's expansion bus, later known as the ISA bus, was based on the Datamaster's I/O bus.

A BeBox, with aftermarket monitor

BeBox

Dual CPU personal computer, briefly sold by Be Inc. to run the company's own operating system, BeOS.

Dual CPU personal computer, briefly sold by Be Inc. to run the company's own operating system, BeOS.

A BeBox, with aftermarket monitor
Connectors of the I/O Board

Five ISA slots

Apollo Computer

Apollo Computer Inc., founded in 1980 in Chelmsford, Massachusetts, by William Poduska (a founder of Prime Computer) and others, developed and produced Apollo/Domain workstations in the 1980s.

Apollo Computer Inc., founded in 1980 in Chelmsford, Massachusetts, by William Poduska (a founder of Prime Computer) and others, developed and produced Apollo/Domain workstations in the 1980s.

Apollo dn330 at Chelmsford, MA, c. 1985

The company moved from a proprietary data bus architecture in favor of IBM's AT-bus, as used in the second generation of IBM PCs, and was simultaneously embracing RISC technology moving towards high-end processors, eventually producing the PRISM line.

'BUILD YOUR OWN TELEVISION RECEIVER.' Science and Invention magazine cover, November 1928

Mark Dean (computer scientist)

American inventor and computer engineer.

American inventor and computer engineer.

'BUILD YOUR OWN TELEVISION RECEIVER.' Science and Invention magazine cover, November 1928

He developed the ISA bus, and he led a design team for making a one-gigahertz computer processor chip.

IBM RT PC

Family of workstation computers from IBM introduced in 1986.

Family of workstation computers from IBM introduced in 1986.

I/O was provided by eight ISA bus slots.

The Compaq Portable was one of the first nearly 100% IBM-compatible PCs.

PC System Design Guide

Series of hardware design requirements and recommendations for IBM PC compatible personal computers, compiled by Microsoft and Intel Corporation during 1997–2001.

Series of hardware design requirements and recommendations for IBM PC compatible personal computers, compiled by Microsoft and Intel Corporation during 1997–2001.

The Compaq Portable was one of the first nearly 100% IBM-compatible PCs.

ISA slots

A Hardcard 20 hard disk on a card with an acrylic cover for display purposes.

Hardcard

Genericized trademark for a hard disk drive, disk controller, and host adapter on an expansion card for a personal computer.

Genericized trademark for a hard disk drive, disk controller, and host adapter on an expansion card for a personal computer.

A Hardcard 20 hard disk on a card with an acrylic cover for display purposes.
2,5″ hard disk drive (540 MB) at an expansion card for the Apple II

Plus Development, a subsidiary of Quantum Corporation, developed the first ISA Hardcard, and released it in October 1985.