INT 81 - Gravis UltraSound - MEGA_EM v3.0+ - SOUNDCARD IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. REDIRECT
	AX = 2012h
	???
Return: ???
Note:	MegaEm calls this function from its GUS IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. handler, and then
	  immediately returns; this permits it to operate while hooking only
	  one interrupt through the memory manager in protected mode
SeeAlso: AX=2010h,AX=2011h