fsMask (USHORT)

      State mask.

      The system state altered by this call. If bits 0 and 1 are off, the echo state of the system is not altered. If bits 2 and 3 are off, the binary and ASCII state of the system is not altered. If bits 0 and 1 are on, or if bits 2 and 3 are on, the function returns an error. If binary mode is set, echo is ignored.

      Bits 15-9

        Reserved.
      Bit 8
        Shift return is on.
      Bit 7
        Length of the turn-around character (meaningful only if bit 6 is on).
      Bit 6
        Turn-around character is modified.
      Bit 5
        Interim character flags are modified.
      Bit 4
        Shift state is modified.
      Bit 3
        ASCII mode is on.
      Bit 2
        Binary mode is on.
      Bit 1
        Echo off.
      Bit 0
        Echo on.


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