The basis for the IBM Micro Channel bus, used in high-end models of IBM's PS/2 series of personal computers. See also EISA

IBM's bus architecture developed for the Personal System/2 computer.

The MCA bus was introduced in the mid-80s by IBM to replace the ISA bus.  Clearly superior to ISA, it was 32-bits wide, supported bus-mastering and provided for "jumper-less" configuration (early Plug and Play).  It eventually failed, however, because IBM choose to make the MCA bus incompatible with ISA, which had a large install base.

The I/O channel used on the POWERstation and POWERserver system units.