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UMBalloc

Allocates an Upper Memory Block.

To determine the largest available UMB block, call this function with the size
parameter set to 0xFFFF.

Header File.....TCXLmem.h

Prototype.......IntT PAS UMBalloc(WrdT np, _SegFP ps);

Arguments.......np -  Number of Paragraphs to Allocate
                ps -  FAR Pointer to location to store returned segment
                      address

Returns.........If the returned segment address is zero, this function
                returns the largest available UMB area.  If the returned
                segment is non-zero, the memory is allocated, and this
                function returns the actual amount allocated.