INT 81 - Gravis UltraSound - MegaEm - ???                                       
	AX = 0400h
	BX = ??? (segment)
Return: AX = ???
	BX = ???
Program: MegaEm is a protected-mode SoundBlasterA common sound card developed by Creative Labs., SoundCanvas, and MT-32
	  emulator for the Gravis UltraSound
SeeAlso: AX=0200h,AX=0202h,AX=0300h,INT 21/AX=FD12h/BX=3457h