450(1)                                                     450(1)



     NAME
          450 - handle special functions of the DASI 450 terminal

     SYNOPSIS
          450

     DESCRIPTION
          450 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).  450 can be used to print
          equations neatly, in the sequence:

               neqn file ... | nroff | 450

          WARNING: make sure that 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.

          450 can be used 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 ...

          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).

     FILES
          /usr/bin/450

     SEE ALSO
          300(1), eqn(1), mesg(1), nroff(1), stty(1), tabs(1), tbl(1),
          tplot(1G), greek(5).



     Page 1                                        (last mod. 1/16/87)

     450(1)                                                     450(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.














































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