/EIGHT_BIT
       /NOEIGHT_BIT

    Controls whether the terminal uses the 8-bit ASCII protocol
    rather than the 7-bit ASCII protocol. You can use the Terminal
    Fallback Facility (TFF) to set the 8-bit characteristic on
    terminals. If the terminal you specify has the TFF enabled,
    the /EIGHT_BIT qualifier has no effect. For more information
    on terminal fallback, see the OpenVMS Terminal Fallback Utility
    Manual (available on the Documentation CD-ROM).