450(1)                                                     450(1)



NAME
     450 - filters text containing printer control sequences  for
     the DASI 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.  The 450
     command converts half-line forward, half-line reverse, and
     full-line reverse motions to the correct vertical motions
     and draws Greek letters and other special symbols in the
     same manner as 300(1).  You can use 450 to print equations
     neatly, as in this sequence:

        neqn file ... | nroff | 450

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

     You can use 450 with the nroff -s option or .rd requests to
     halt printing temporarily so that you can insert paper
     manually or change fonts in the middle of a document.
     Instead of pressing the RETURN key in these cases, press the
     line-feed key to continue printing.

     In many (but not all) cases, the use of 450 can be
     eliminated in favor of one of the following commands:

        nroff -T450file...

        nroff -T450 -12file...

     Thus, you can often avoid using 450 unless special delays or
     options are required; in a few cases, however, the
     additional movement optimization of 450 may produce better-
     aligned output.

WARNINGS
     Make sure that the PLOT switch on your terminal is set to
     ``on'' before you use 450.  You should set the SPACING
     switch to 10-pitch or 12-pitch.  In either case, vertical
     spacing is 6 lines per inch unless you dynamically change
     the vertical spacing to 8 lines per inch by an appropriate
     escape sequence.

LIMITATIONS
     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 or reverse line



January 1992                                                    1

450(1)                                                     450(1)



     feeds, use a friction-feed platen instead of a forms
     tractor.  Although the forms tractor is good enough for
     drafts, it has a tendency to slip when reversing direction.
     This slippage causes distortion of Greek characters and
     misalignment of the first line of text after one or more
     reverse line feeds.

FILES
     /usr/bin/450
          Executable file

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

     greek(5) in A/UX Programmer's Reference







































2                                                    January 1992