The Free On-line Dictionary of Computing (30 December 2018):

Multimedia Personal Computer

    (MPC) A specification published by the Multimedia
   PC Marketing Council in 1990 to encourage the adoption of a
   standard multimedia computing platform.  In May 1993, the
   MPC Marketing Council published a new specification called
   MPC Level 2 Specification as an enhanced multimedia computer
   standard.  The original MPC specification, now also known as
   the MPC Level 1 Specification, continues in full effect.

   The appearance of the MPC or MPC2 certification mark on a
   computer system or upgrade kit indicates that the hardware
   meets the corresponding (Level 1 or Level 2) MPC Marketing
   Council specification. Software bearing the Multimedia PC mark
   has been designed to work on Multimedia PC licensed hardware.

   By establishing a standard platform, certifying hardware
   compliance and providing inter-operability between software
   and hardware for the consumer, the MPC Marketing Council is
   encouraging widespread use of multimedia applications and
   hardware.

   (1997-01-19)