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)
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