450(1)                               SysV                               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).  Use 450 to print equations neatly,
     in the sequence:

          neqn file ... | nroff | 450

     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 RETURN in these cases, you must use the line-feed key to get
     any response.

     Frequently, you can eliminate using 450 in favor of one of the following:

          nroff -T450 files ...
     or
          nroff -T450-12 files ...

     Using 450 can thus often be avoided unless special delays or options are
     required; in a few cases, however, the additional movement optimization
     of 450 can produce better-aligned output.

     neqn names of, and resulting output for, the Greek and special characters
     supported by 450 are shown in greek(5).

NOTE
     Unless your system contains DOCUMENTER'S WORKBENCH Software, certain
     commands (e.g., eqn, nroff, tbl) will not work.

WARNING
     Make sure the PLOT switch on your terminal is ON before you use 450.  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/inch by an appropriate escape sequence.

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.

SEE ALSO
     300(1), mesg(1), stty(1), tabs(1), graph(1G), tplot(1G).
     eqn(1), nroff(1), tbl(1) in the UNIX System V Documentor's Workbench
     Reference Manual.
     greek(5) in the SysV Programmer's Reference.