upper memory block


Also found in: Acronyms.

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.
References in periodicals archive ?
EXE program is also used to create Upper Memory Blocks.
The second variant of this command, DOS=UMB, allows MS-DOS to access upper memory blocks when loading programs and device drivers; Dos=noumb specifies that DOS should not manage upper memory blocks and, since Dos=noumb is the default option, there is no reason to include this option in our CONFIG.
EXE is to provide access to those upper memory blocks.

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