Compatibility: 5.0+
Expects: AX    5802H
                                                                  
Returns: AL    01H = upper  memory is currently linked
00H = not linked (all allocations go to conventional  mem)
CF    always clear (CF=NC=0)
                                                                  
Info: Obtains a code indicating whether programs can allocate memory
from UMBs .

See Accessing Upper Memory for info on allocating from UMBs.

See Also: Fn 48H (allocate memory)
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DOS Fn 5802H: Query Upper-Memory Link State