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+.TH PSI 9.1
+.CT 1 writing_output
+.SH NAME
+psi \- postscript interpreter
+.SH SYNOPSIS
+.B psi
+[
+.I option ...
+] [
+.I file
+]
+.SH DESCRIPTION
+.I Psi
+reads Postscript input from
+.I file
+or from standard input
+and simulates the resulting pages in a
+.IR mux (9.1)
+layer.
+The program remains in the layer at exit; further invocations of
+.I psi
+in that layer avoid download time.
+.PP
+The options are
+.TP
+.BI -p n
+Display page
+.IR n ,
+where
+.I n
+is determined from the
+.B %%Page
+comments in the file.
+If these are not present, page selection will not work.
+.TP
+.B -R
+Pages in the file are in reverse order. This flag must be used on such files
+for the
+.I -p
+option to work.
+.TP
+.B -r
+Display the image at full scale, with the bottom left
+corner positioned at the bottom left corner of the window.
+(By default, the image is scaled to fit the window, maintaining
+the aspect ratio of a printer.)
+.HP
+.B -a
+.I x y
+.br
+Display the image at full scale with position
+.I x,y
+of the image placed at the bottom left corner of the window.
+.PP
+.I Psi
+works on either a Teletype 5620, 630 or 730 terminal
+as determined by the environment variable
+.BR TERM .
+.PP
+Fonts are implemented with size-24 bitmap fonts.
+Those available are
+Symbol, Courier, Times-Roman, Times-Italic, Times-Bold, Times-BoldItalic, Helvetica,
+Helvetica-Oblique, Helvetica-Bold, Helvetica-BoldOblique.
+Fonts
+Courier-Bold,
+Courier-Oblique,
+and
+Courier-BoldOblique
+are mapped to
+Courier.
+Other postscript fonts, including type1, may be used if
+they are supplied before they're referenced.
+.PP
+When the `cherries' icon is displayed, use mouse button 3
+to move forward
+.RB ( more ),
+to a particular page
+.RB ( page ),
+or quit 
+.RB ( done ).
+Button 2 exits the program completely.
+.SH EXAMPLES
+.TP
+.L
+troff -ms memo | lp -dstdout -H | psi
+.br
+.ns
+.TP
+.L
+troff -ms memo | dpost | psi
+Two equivalent ways to format a memo, convert it to PostScript,
+and display it.
+.PP
+For best results with TeX documents, use
+.B dvips
+with the
+.BR -Tjerq ,
+.BR -Tgnot ,
+or
+.B "-D 100"
+option to get fonts of the proper resolution and run
+.I psi
+with the
+.I -r
+or
+.I -a
+flag to prevent
+.I psi
+from scaling.
+.SH FILES
+.TF psi.err
+.TP
+.F psi.err
+error messages
+.SH SEE ALSO
+.IR lp (1),
+.IR dvips (1),
+.IR postscript (8),
+.IR proof (9.1),
+.IR psifile (1),
+.IR psix (1)
+.SH DIAGNOSTICS
+A `dead mouse' icon signals an error;
+error comments are placed on file
+.FR psi.err .
+.PP
+Symbols that lack bitmaps are replaced by `?'
+and an error is reported.
+.SH BUGS
+A psi layer imitates
+.LR "term 33" ,
+not
+.IR mux .
+Among other difficulties, it will not be reusable if downloaded
+across the network.
+.br
+Unimplemented PostScript features are rotated images and
+half tone screens.
+Imagemasks may only be rotated by multiples of 90 degrees, not
+by arbitrary angles.
+.br
+Skipping pages may cause operators to be undefined.