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Wiktionary
micromainframe

n. A computer resembling a mainframe but significantly smaller in physical size.

Wikipedia
MicroMainframe

The designation Micromainframe (also rendered as MicroMainframe or Micro-mainframe) may have at least two different meanings, depending on the context and originating company:

  • The Commodore PET#SuperPET 9000 series microcomputer
  • The Intel iAPX 432 multiple-chip microprocessor

See also: Micro-mainframe link