INT 81 - Gravis UltraSound - MEGA_EM v3.0+ - INT 78 REDIRECT                    
	AX = 2010h
	???
Return: ???
Note:	MegaEm calls this function from its INT 78 handler, and then
	  immediately returns (via RETF in v3.10, thus leaving the flags on
	  the stack); this permits it to operate while hooking only one
	  interrupt through the memory manager in protected mode
SeeAlso: AX=2011h,AX=2012h