INT 33 - MS MOUSE v1.0+ - RETURN POSITION AND BUTTON STATUS                     
	AX = 0003h
Return: BX = button status (see #03168)
	CX = column
	DX = row
Note:	in text modes, all coordinates are specified as multiples of the cell
	  size, typically 8x8 pixels
SeeAlso: AX=0004h,AX=000Bh,INT 2F/AX=D000h"ZWmous"


Bitfields for mouse button status:
Bit(s)	Description	(Table 03168)
 0	left button pressed if 1
 1	right button pressed if 1
 2	middle button pressed if 1 (Mouse Systems/Logitech/Genius)
                                                                                

INT 33 - CuteMouse 2.1b4+ - RETURN POSITION, BUTTON STATUS AND WHEEL COUNTER    
        AX = 0003h

Return: BL = buttons status
        BH = 8-bit signed counter of wheel movement since last call
        CX = column
        DX = row

Notes:  returned wheel counter contains all wheel movements accumulated since
        the last call to INT 33/AX=0003h, INT 33/AX=0005h/BX=-1 or
        INT 33/AX=0006h/BX=-1
        positive value of wheel counter means downward wheel movement
        this call also clears the wheel movement counter