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

       /PAGE=lines-per-page

    Establishes the number of lines per page on the currently
    installed form; the number of lines can range from 1 to 255 and
    defaults to 64. The printer driver uses this value to determine
    the number of line feeds that must be entered to simulate a form
    feed.