upper memory block

1 definition found

upper memory block - Free On-line Dictionary of Computing (26 May 2007) :

  upper memory block
  
     <storage> (UMB) Up to 64 kilobytes of the expanded memory page frame
      above the first 64 kilobytes.  The UMB can be used
     to store TSR programs or device drivers thereby freeing
     parts of the precious conventional memory.  The UMB is
     provided by special memory manager programs; many EMMs can
     provide UMB as well.
  
     (1996-01-10)