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  The PS/2 models 50, 60, and 80 introduced a new bus hardware design that
  IBM calls Micro Channel architecture. Both the Micro Channel bus in the
  PS/2s and the earlier PC and PC/AT bus accomplish the same task of
  communicating addresses and data to plug-in adapters. The Micro Channel
  bus hardware is designed to run at higher speeds than its predecessors
  as well as to allow for more flexible adapter hardware designs. The
  Micro Channel differs from the PC and PC/AT bus design both in its
  physical layout and in its signal specifications, so an adapter that can
  be used with one bus is incompatible with the other.

  The differences between the original PC bus, the PC/AT bus, and the
  Micro Channel bus are important in operating system software but not in
  applications programs. Although all programs rely implicitly on the
  proper functioning of the address and data buses, very few programs are
  actually concerned with programming the bus directly. We'll come back to
  the Micro Channel architecture only when we describe PS/2 ROM BIOS
  services that work specifically with it.