INT 33 - PCMOUSE - GET MSMOUSE STORAGE REQUIREMENTS                             
	AX = 0042h
Return: AX = status
	    0000h MSMOUSE not installed
	    0042h functions 42h, 50h, and 52h not supported
	    FFFFh successful
		BX = buffer size in bytes for functions 50h and 52h
Note:	this function is also supported by the Genius Mouse 9.06 driver
SeeAlso: AX=0015h,AX=0050h,AX=0052h