Micro Channel Architecture

(redirected from MCA bus)

Micro Channel Architecture

(architecture)
(MCA) IBM's proprietary 32-bit bus, used in high-end PS/2 personal computers. Micro Channel is designed for multiprocessing. It eliminates potential conflicts that arise when installing new peripheral devices. MCA is *not* compatible with either EISA or XT bus architecture so older cards cannot be used with it.

As with the ROM BIOS in the first IBM PCs, figuring out the Micro Channel's secrets has been an arduous task of reverse engineering ever since the PS/2 line was announced. Consequently, the MCA has never become as wide spread as the competing EISA standard.
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References in periodicals archive ?
Owners of pure IBM machines have no choice - they get the MCA bus. * Hard disk.
The patent cross-licensing agreement gives each manufacturer rights to the other's patents--including Compaq's access to Big Blue's MCA bus.
The trouble was that all the boards that had been developed for the AT bus, now known as the Industry Standard Architecture (ISA), were incompatible with MCA bus machines.