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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
upper memory block
(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)