300
PURPOSE
Handles special line-motion functions for DASI 300/300s
work stations.
SYNOPSIS
300 [ +12 ] [ -n ] [ -dt,l,c ]
300s [ +12 ] [ -n ] [ -dt,l,c ]
DESCRIPTION
Note: If your work station has a PLOT switch, make sure
this switch is turned "on" before using this command.
The 300 command reads standard input, processes its input
for printing on the DASI 300, GSI 300, or DTC 300 work
stations, and writes to standard output. The 300s
command performs the same functions for the DASI 300s,
GSI 300s, and DTC 300s. They convert the input files'
motion control characters for half-line forward, half-
line reverse, and full-line reverse into motion commands
recognized by these work stations.
You can use the 300 and 300s commands to draw Greek char-
acters and other special symbols that require more than
one vertical line, and it allows you to use 12-pitch
text. For a discussion of special symbols and greek
characters supported by 300, see "greek."
The nroff command can be used with the 300 command to
format text. 300 must be used if you use special delays
or formatting options. You can either pipe from nroff to
300 or use the -T300 flag with nroff to specify the
printing device. The movement control of the 300 command
usually produces better aligned output than nroff -T300.
When using nroff, the -s flag or .rd requests are
required for inserting paper manually or changing fonts
in the middle of a document. In these cases, you must
press the line feed key to continue printing.
Using the 300 command with the neqn command will give you
the best display of your equations. You can use the fol-
lowing sequence to display equations:
neqn file . . . | nroff | 300
Note: Some special characters cannot be correctly
printed in column 1 because the print head cannot be
moved to the left from that position.
If your output contains Greek characters or reverse line
feeds, use a friction-feed platen instead of a forms
tractor. A forms tractor slips when reversing direction.
FLAGS
-dt,len,c Controls output delay factors. The default
setting is -d3,90,30. DASI 300 is too slow to
handle very long lines, too many tab charac-
ters, or long strings with no blanks and no
identical characters. One null character is
inserted in a line for every set of t tabs,
and for every contiguous string of c nonblank,
nontab characters. When a line is longer than
len bytes, several nulls (the line length
divided by 20, plus one) are inserted at the
end of that line. In all three cases, the
nulls delay the output enough to avoid a
problem. Items can be omitted from the end of
the list, implying the default values.
Entering zero for t results in insertion of
two null bytes per tab, while entering zero
for c results in insertion of two null bytes
per character.
When printing C Language programs, using
"-d0,1" will help adjust for the many indenta-
tion levels. When printing files like
/etc/passwd, using "-d3,30,5" will help print
it properly.
This flag affects carriage return and line
feed delays. The stty parameters nl0 cr2 or
nl0 cr3 are recommended for most uses.
-num Controls the size of half-line spacing. The
default half-line values (which are exact
half-lines) of num are:
10-pitch, 6 lines-per-inch, num=4
12-pitch, 8 lines-per-inch, num=3
12-pitch, 6 lines-per-inch, num=4
You can use other values for num to change the
appearance of subscripts and superscripts.
For example, -2 makes nroff half-lines act
like quarter-lines.
+12 Uses 12-pitch, 6 lines-per-inch text. The
DASI 300 normally allows only two combina-
tions: 10-pitch, 6 lines per inch, or
12-pitch, 8 lines per inch. To use the
12-pitch, 6 lines-per-inch combination, set
the PITCH switch to "12" and use the +12 flag
on the command line.
RELATED INFORMATION
The following commands: "450," "eqn, neqn, checkeq,"
"graph," "mesg," "nroff, troff," "stty," "tbl," and
"tplot."
The greek miscellaneous facility in AIX Operating System
Technical Reference.