Micro Channel architecture

Micro Channel architecture, or the Micro Channel bus, is a proprietary16- or 32-bitparallel 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 In IBM products, it superseded the ISA bus and was itself superseded by the PCI bus architecture.