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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
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treeb460cd850d0537eb71806ba30358840377b27688 /static/v10/man1/450.1
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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.