/FORM_SIZE=n

    Specifies the maximum number of lines per page including running
    heads and running feet. Defaults to /FORM_SIZE=66, which is
    standard for 11-inch paper. For laser printers, set the number
    of lines as follows:

    Paper
    Size       Lines Mode

    8.05       69    Landscape
    8.28       71    Landscape (LN01E default)
    8.51       73    Landscape (LN01, LN03 default)
    11.00      66    Portrait (LN01, LN03 default)
    11.66      70    Portrait (LN01E default)
    12.33      74    Portrait
    13.00      78    Portrait
    14.00      84    Portrait

    When used with the /SIMULATE qualifier, the /FORM_SIZE qualifier
    controls the physical size of the page by putting out line feeds
    to match the number specified by the value n. When used with the
    /NOSIMULATE qualifier, the /FORM_SIZE=n qualifier causes DSR to
    suppress the form feed that DSR would normally insert at the line
    number specified by the value n. If the number of lines that DSR
    is going to put on any given page does not match the value n, a
    form-feed character is written into the output file.

    The default value for the value n is derived from the OpenVMS
    Run-Time Library (RTL) routine LIB$LP_LINES. This defaults to
    66 unless the logical SYS$LP_LINES is defined, in which case the
    assigned value is used. To change the default value, specify a
    different value for the /FORM_SIZE=n qualifier.