`.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 don't use `.psize', listings will use a default line-count of
60.  You may omit the comma and COLUMNS specification; the default
width is 200 columns.

   `as' will generate 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'.