/sys$common/syshlp/helplib.hlb SET, TERMINAL, Qualifiers, /DISMISS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /DISMISS
       /NODISMISS (default)

    Controls whether the terminal driver ignores data that causes a
    parity error (instead of terminating the currently outstanding
    I/O with an error status).