VMS Help SET, HOST, /LAT, Qualifiers, /EIGHT_BIT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /EIGHT_BIT (default)
       /NOEIGHT_BIT

    Determines whether the outgoing terminal line supports 8-bit or
    7-bit characters. By default, 8-bit characters are supported. If
    you specify /NOEIGHT_BIT, then 7-bit characters are supported.

                                   NOTE

       To change the number of bits per character on the remote
       terminal server port, that port must have the REMOTE
       MODIFICATION characteristic enabled.