Upper Memory Block A specific area of the main memory. UMB is a blank memory area of UMA in the MS-DOS environment where device drivers and memory-resident programs can be assigned, and is part of the XMS standards.
Abbreviation for upper memory block. upper memory area The 384 KB of RAM located between 640 KB and 1 MB. A utility called a memory manager can create UMBs in the upper memory area, in which you can load device drivers and memory-resident programs.
Upfront Mortgage Broker. A mortgage broker who charges a set fee for services provided, established in writing at the outset of the transaction, and acts as the borrower's agent in shopping for the best deal.