INT 21 - DOS 3+ - SET COUNTRY CODE
        AH = 38h
        AL = 01h thru 0FEh for specific country with code <255
        AL = FFh for specific country with code >= 255
           BX = 16-bit country code
        DX = FFFFh
Return: CF set on error
            AX = error code (see AH=59h)
        CF clear if successful
Note:   not supported by OS/2