as: Psize

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1 7.71 '.psize LINES , COLUMNS'
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1 
1 Use this directive to declare the number of lines--and, optionally, the
1 number of columns--to use for each page, when generating listings.
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1    If you do not use '.psize', listings use a default line-count of 60.
1 You may omit the comma and COLUMNS specification; the default width is
1 200 columns.
1 
1    'as' generates formfeeds whenever the specified number of lines is
1 exceeded (or whenever you explicitly request one, using '.eject').
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1    If you specify LINES as '0', no formfeeds are generated save those
1 explicitly specified with '.eject'.
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