INT 62 u - FGDRIVER v3.03 - "FG_CHGTEXT" - DISPLAY STRING AT CURSOR POSITION
        AX = 000Ch
        CX = length of string
        ES:BX -> string to be displayed
Return: text cursor updated
Notes:  For FGDRIVER v1.10, this function was "FG_XALPHA" (see AX=00B0h);
          "FG_CHGTEXT" was AX=0036h
        This call is ignored in graphics modes
SeeAlso: AX=000Bh,AX=007Ch

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