PWB1/usr/man/man1/450.1

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.th 450 I 5/31/77
.sh NAME
450 \*- handle special functions of DASI450 terminal
.sh SYNOPSIS
.bd 450
.sh DESCRIPTION
.it 450
supports special functions of, and optimizes the use of the DASI450
terminal,
or any terminal that is functionally identical,
such as the DIABLO 1620 or 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
.it "gsi(I)."
.it 450
can be used
to print equations neatly, in the sequence:
.s3
     neqn file ... \*v nroff \*v 450
.s1
NOTE:
.it 450
can be used with the
.it nroff
.bd \-s
flag or .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.
.s1
However, in most cases,
.it 450
can be eliminated in favor of the following:
.s1
.bd "nroff \*-T450"
.it files...
or
.bd "nroff \*-T450\*-12"
.it files...
.s1
In a few cases, the additional movement optimization of
.it 450
may produce better-aligned output.
.s1
The SPACING switch may be in either 10-pitch or 12-pitch position
(but that setting can be overridden dynamically).
In either case, vertical spacing is 6 lines/inch,
unless dynamically changed to 8 lines per inch by an appropriate escape sequence.
.sh "SEE ALSO"
graph(I), gsi(I), mesg(I), neqn(I), stty(I), tabs(I),
greek(V),
DASI450(VII),
terminals(VII)
.sh BUGS
Some Greek characters can't be correctly printed in column 1
because the print head cannot be moved to the left from there.
If your output contains much Greek and/or reverse line feeds,
use friction feed 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 after a long set
of reverse line feeds.