mrom

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

Mask Read-Only Memory
MROM

   <storage> (MROM) A kind of {ROM} in which the memory contents
   are determined by one of the masks used to manufacture the
   {integrated circuit}.  MROM can give high storage density
   (bits per millimeter squared) making it a cheap solution for
   high volume applications.

   [Other ROM types?]

   (1995-04-22)

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

MROM
       Macrocode Mask Read Only Memory (ROM)

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

MROM
       Mask Read Only Memory (ROM)