450(1) (Terminal Filters Utilities) 450(1)
NAME
450 - handle special functions of the DASI 450 terminal
SYNOPSIS
450
DESCRIPTION
The 450 command supports special functions of, and optimizes
the use of, the DASI 450 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 300(1). It should be noted
that, unless your system contains DOCUMENTER'S WORKBENCH
Software, certain commands (e.g., eqn, nroff, tbl, etc.)
will not work. Use 450 to print equations neatly, in the
sequence:
neqn file ... | nroff | 450
WARNING. make sure the PLOT switch on your terminal is ON
before 450 is used. The 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.
Use 450 with the nroff -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.
In many (but not all) cases, the use of 450 can be
eliminated in favor of one of the following:
nroff -T450 files ...
or
nroff -T450-12 files ...
Page 1 May 1989
450(1) (Terminal Filters Utilities) 450(1)
The use of 450 can thus often be avoided unless special
delays or options are required; in a few cases, however, the
additional movement optimization of 450 may produce better-
aligned output.
The neqn names of, and resulting output for, the Greek and
special characters supported by 450 are shown in greek(5).
SEE ALSO
300(1), mesg(1), stty(1), tabs(1).
BUGS
Some special characters cannot be correctly printed in
column 1 because the print head cannot be moved to the left
from there.
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.
Page 2 May 1989