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INT 15 - EXTENDED MEMORY - GET MEMORY SIZE (AT,XT286,PS)
        AH = 88h
Return: AX = memory size in K
SeeAlso: AH=87h
Note:   TSRs which wish to allocate extended memory to themselves often hook
          this call, and return a reduced memory size.  They are then free to
          use the memory between the new and old sizes at will.