INT 2F - MediaVision MVSOUND.SYS - INSTALLATION CHECK                           
	AX = BC00h
	BX = 3F3Fh ('??')
	CX = 0000h
	DX = 0000h
Return: if installed, BX XOR CX XOR DX = 4D56h ('MV')
Program: MVSOUND.SYS is a driver for the MediaVision ProAudio Spectrum family
	  of sound boards; its primary programmer was Bryan Crane
SeeAlso: AX=BC01h"MVSOUND",AX=BC02h,AX=BC03h,AX=BC04h,AX=BC06h"MVSOUND"