VMS Help DIFFERENCES, Qualifiers, /WIDTH  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /WIDTH=n

    Specifies the width of the lines in the output file. The default
    is 132 characters. If output is written to the terminal, the
    /WIDTH qualifier is ignored and the terminal line width is used.

    Use the SET TERMINAL command to change the terminal line width.