Int 78 Fn 0000  - Hugerealmode Driver - Installation Check                 [E]

   AX = 0000h

Return: AX = DBCAh if installed
Program: the HugeRealMode driver was published in the German DOS Extra Nr. 20
     (1992), and makes a 4G flat address space (for both data and code)
     available to real-mode DOS programs

See Also: AX=0001h