INT 10 - EGA Register Interface Library - INTERROGATE DRIVER
        AH = FAh
        BX = 0000h
Return: BX = 0000h if mouse driver not present
        ES:BX -> EGA Register Interface version number, if present:
            byte 0 = major release number
            byte 1 = minor release number
Note:   the RIL is provided by EGA.SYS, the Microsoft Mouse driver, the OS/2
          compatibility box, and others
SeeAlso: INT 2F/AX=BC00h