INT 62 u - FGDRIVER v3.03 - "FG_MAPRGB" - MAP COLOR COMPONENTS INTO PALETTE VAL
        AX = 005Ah
        BX = red component
        CX = green component
        DX = blue component
Return: AX = mode-specific palette value corresponding to specified components
Notes:  For FGDRIVER v1.10, this function was "FG_SAVE" (see AX=0087h);
          "FG_MAPRGB" was AX=001Dh
        This function is only meaningful in 16-color graphics modes
SeeAlso: AX=0042h,AX=0096h

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