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+.TH 450 1
+.SH NAME
+450 \- handle special functions of the DASI 450 terminal
+.SH SYNOPSIS
+.B 450
+.SH DESCRIPTION
+.I 450\^
+supports special functions of, and optimizes the use of, the
+.SM DASI
+450
+terminal,
+or any terminal that is functionally identical,
+such as the
+.SM DIABLO
+1620 or
+.SM XEROX
+1700.
+It converts half-line forward, half-line reverse, and full-line reverse
+motions to the correct vertical motions.
+It also
+attempts to draw Greek letters and other special symbols
+in the same manner as
+.IR 300 (1).
+.I 450\^
+can be used
+to print equations neatly, in the sequence:
+.PP
+.RS
+neqn\| file\| .\|.\|.\| \(bv\| nroff\| \(bv\| 450
+.RE
+.PP
+.SM WARNING:
+make sure that the
+.SM PLOT
+switch on your terminal is
+.SM ON
+before
+.I 450\^
+is used.
+The
+.SM SPACING
+switch should be put in the desired position (either 10- or 12-pitch).
+In either case, vertical spacing is 6 lines/inch,
+unless dynamically changed to 8 lines per inch by an appropriate escape sequence.
+.PP
+.I 450\^
+can be used with the
+.IR nroff (1)
+.B \-s
+flag or
+.B \&.rd
+requests, when it is necessary to insert paper manually or change fonts
+in the middle of a document.
+Instead of hitting the
+return
+key in these cases,
+you must use the
+line-feed
+key to
+get any response.
+.PP
+In many (but not all) cases, the use of
+.I 450\^
+can be eliminated in favor of one of the following:
+.PP
+.RS
+nroff\| \-T450\| files\| .\|.\|.
+.RE
+or
+.RS
+nroff\| \-T450\-12\| files\| .\|.\|.
+.RE
+.PP
+The use of
+.I 450\^
+can thus often be avoided unless
+special delays or options are required;
+in a few cases, however, the additional movement optimization of
+.I 450\^
+may produce better-aligned output.
+.PP
+The
+.IR neqn (1)
+names of, and
+resulting output for, the Greek and special characters supported
+by
+.I 450\^
+are shown in
+.IR greek (7).
+.SH SEE ALSO
+.IR 300 (1),
+.IR eqn (1),
+.IR graph (1G),
+.IR mesg (1),
+.IR stty (1),
+.IR tabs (1),
+.IR tbl (1),
+.IR tplot (1G),
+.IR troff (1),
+.IR greek (7).
+.SH BUGS
+Some special characters cannot be correctly printed in column 1
+because the print head cannot be moved to the left from there.
+.br
+If your output contains Greek and/or reverse line-feeds,
+use a friction-feed platen instead of a forms tractor;
+although good enough for drafts,
+the latter has a tendency to slip when reversing direction,
+distorting Greek characters and misaligning the first line of text after one or more
+reverse line-feeds.