450

PURPOSE

     Handles special  line-motion functions  for the  DASI 450
     work station

SYNOPSIS
     450 [ -f ]


DESCRIPTION

     The 450 command reads  standard input, processes its data
     for output  on a DASI  450 or an equivalent  work station
     (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  on
     standard output.   It attempts  to draw  Greek characters
     and other special  symbols in the same manner  as the 300
     command vertical line space.  See  "greek"  for a list of
     symbols supported by 450.

     Use 450 with  the nroff -s flag or .rd  requests when you
     need  to insert  paper manually  or change  fonts in  the
     middle of a document.  Instead of using the return key in
     these cases, you must use a  the line feed key to get any
     response.  In many cases you  can use nroff -T450 instead
     of the  450 command.   However, you must  use 450  if you
     require special delays or options.  In a few cases, using
     450 may produce better aligned  output.  You can pipe the
     output  of the  neqn command  to 450  to print  equations
     neatly.

     Notes:

     1.  Make sure the  PLOT switch is turned  on before using
         this command.  Also, the  SPACING switch should be in
         the desired  position, either  10- or  12-pitch.  For
         either setting, vertical spacing  is 6 lines per inch
         unless  changed to  8  lines per  inch  by an  escape
         sequence.

     2.  Some special  characters cannot be  correctly printed
         in column 1 because the print head cannot be moved to
         the left from that position.

     3.  If your  output contains Greek characters  or reverse
         linefeeds, use  a friction-feed  platen instead  of a
         forms tractor.   A forms  tractor tends to  slip when
         reversing direction.

FLAG

     -f   Permits the  use of  ETX/ACK protocol with  1200 bps
          printers.  You  cannot use 450  with this flag  in a
          pipeline or if you  redirect its output.  Instead it
          must drive the printer directly.

RELATED INFORMATION

     The  following commands:   "300,"  "eqn,  neqn, checkeq,"
     "graph,"   "greek,"   "mesg," "nroff,  troff,"   "stty,"
     "tabs," "tbl,"  "tplot," and  "troff."

     The greek miscellaneous facility  in AIX Operating System
     Technical Reference.