Int 2F Fn 8000  - FAXBIOS Interface - Installation Check                   [F]

   AX = 8000h
   DX = 0000h
   DI = 0000h

Return: AL = FFh if installed
   DX:DI -> signature "FaxBiosjpc"

Note:  FaxBIOS may use any multiplex number from 80h through FFh; to determine
     whether it is installed, it is necessary to poll all multiplex
     numbers for one which returns the above signature

See Also: AH=2Ah,AX=80FBh