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upper memory block

upper memory block in Technology
(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.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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