INT 33 - MS MOUSE v6.26+ - GET MAXIMUM VIRTUAL COORDINATES                      
	AX = 0026h
Return: BX = mouse-disabled flag (0000h mouse enabled, nonzero disabled)
	CX = maximum virtual X (for current video mode)
	DX = maximum virtual Y
Note:	for driver versions before 7.05, this call returns the currently-set
	  maximum coordinates; v7.05+ returns the absolute maximum coordinates
SeeAlso: AX=0031h
                                                                                

INT 33 - Genius Mouse 9.06 - ???                                                
	AX = 0026h
Return: CX = 0204h if CX was 0105h on entry, else unchanged