MCA

from The Free On-line Dictionary of Computing (8 July 2008)

Micro Channel Architecture
MCA

   <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.

   (1996-08-16)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

MCA
       Micro Channel Architecture (IBM, PS/2)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

MCA
       Mission Critical Applications

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

MCA
       Model Centric Architecture (Skynamics)