Int 33 Fn 0030  - MS Mouse V7.04+ - Get/set Ballpoint Information          [M]

   AX = 0030h
   CX = command
       0000h get status of BallPoint device
       other set rotation angle and masks
       BX = rotation angle (-32768 to 32767 degrees)
       CH = primary button mask
       CL = secondary button mask

Return: AX = button status (FFFFh if no BallPoint)
       bit 5: button 1
       bit 4: button 2
       bit 3: button 3
       bit 2: button 4
       other: zero
   BX = rotation angle (0-360 degrees)
   CH = primary button mask
   CL = secondary button mask