Micro Channel architecture

Micro Channel

Micro Channel architecture
IBM XGA-2 32-bit graphics card
Year created	1987 (1987)
Created by	IBM
Supersedes	ISA
Superseded by	PCI (1993)
Width in bits	16 or 32
Speed	10 MHz
Style	Parallel
Hotplugging interface	No
External interface	No

This article is about a computer bus. For small-sized liquid ducts, see Microchannel (microtechnology).

Two 16-bit MCA slots (top and middle). At the bottom is an MCA slot for an IBM 8514 card.

Micro Channel architecture, or the Micro Channel bus, is a proprietary 16- or 32-bit parallel computer bus publicly introduced by IBM in 1987, which was used on PS/2 and other computers until the mid-1990s. Its name is commonly abbreviated as "MCA", although not by IBM. In IBM products, it superseded the ISA bus and was itself superseded by the PCI bus architecture.