INT 33 - MS MOUSE - RESET DRIVER AND READ STATUS
        AX = 0000h
Return: AX = status
            0000h hardware/driver not installed
            FFFFh hardware/driver installed
        BX = number of buttons
            0000h other than two
            0002h two buttons (many drivers)
            0003h Mouse Systems/Logitech three-button mouse
            FFFFh two buttons
Notes:  to use mouse on a Hercules-compatible monographics card in graphics
          mode, you must first set 0040h:0049h to 6 for page 0 or 5 for page 1,
          and then call this function.  Logitech drivers v5.01 and v6.00
          reportedly do not correctly use Hercules graphics in dual-monitor
          systems, while version 4.10 does.
        the Logitech mouse driver contains the signature string "LOGITECH"
          three bytes past the interrupt handler; many of the Logitech mouse
          utilities check for this signature.
SeeAlso: AX=0021h,AX=002Fh,INT 62/AX=007Ah,INT 74