INT 62 u - FGDRIVER v3.03 - "FG_BESTMODE" - GET BEST VIDEO MODE GIVEN RESOLUTN
        AX = 0005h
        BX = horizontal resolution
        CX = vertical resolution
        DX = number of video pages required (both physical and virtual)
Return: AX = proposed video mode number or FFFFh if no matching video mode
Notes:  For FGDRIVER v1.10, this function was "FG_EGACHECK" (see AX=0023h);
           "FG_BESTMODE" was AX=0003h
        You must first call "FG_SVGAINIT" (see AX=00A1h) to get SVGA video
          modes
SeeAlso: AX=0004h,AX=003Fh,AX=0093h,AX=00A1h,AX=00A7h

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