


      450(1)                        (DWB)                        450(1)



      NAME
           450 - handle special functions of the DASI 450 terminal

      SYNTAX
           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

           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.

           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 ...

           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), eqn(1), nroff(1), tbl(1).
           In ROS Reference Manual, graph(1), greek(5), mesg(1),
           stty(1), tabs(1), and tplot(1).

      BUGS



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      450(1)                        (DWB)                        450(1)



           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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