Int 10 Fn FA  - EGA Register Interface Library - Interrogate Driver        [V]

   AH = FAh
   BX = 0000h

Return: BX = 0000h if RIL 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

See Also: AH=F6h,INT 2F/AX=BC00h