Get/Set country-dependent information (INT 21h, 38h)

        Set current country:
          Entry:
            AX = 38FFh
            BX = Country code
            DX = FFFFh
          Return:
            CF = 1 on error

        Get country information:
          Entry:

            If you want information for current country then
              AX = 3800h
            else
              AX = 38FFh
              BX = Country code
            DS:DX = Address of buffer for returned DOS Country
                    information (DCI)
          Return:
            CF = 1 on error (AX = errorcode)
            BX = country code
            DS:DX with DCI