INT 62 u - FGDRIVER v3.03 - "FG_INITXMS" - INITIALIZE EXTENDED MEMORY USE
        AX = 004Eh
Return: AX = status
            0000h successful
            FFFFh extended memory manager inaccessible or not installed
Note:   For FGDRIVER v1.10, this function was "FG_DISPLAYP" (see AX=001Ah);
          "FG_INITXMS" was AX=00A1h
SeeAlso: AX=0003h,AX=004Ch

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