as.info: Psize

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`.psize LINES , COLUMNS'

   Use this directive to declare the number of lines--and, optionally,
the number of columns--to use for each page, when generating listings.
   If you do not use `.psize', listings use a default line-count of 60.
You may omit the comma and COLUMNS specification; the default width is
200 columns.
   `as' generates formfeeds whenever the specified number of lines is
exceeded (or whenever you explicitly request one, using `.eject').
   If you specify LINES as `0', no formfeeds are generated save those
explicitly specified with `.eject'.