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SET TTY or TTY Command
The SET TTY command (or TTY command) declares properties of the
terminal on which the command is typed. The word TERMINAL can be
used instead of the word TTY in the SET TTY command.
The system has a terminal default for any terminal that has not
been declared to be of a particular type. This default is
generic TTY. Before you specify the characteristics of your
terminal, the TTY defaults are in effect. The exceptions to this
are terminal input and output speeds.
To discover the characteristics that the system has assigned to
your terminal, use the INITIA TTY command. This is illustrated
in the example.
If you use the SET TTY TYPE command, the system assumes defaults
according to the terminal type you declared. These defaults, and
the defaults for TTY, are listed below:
Terminal Hardware Characteristics
T L T F W D F L A
Y O A O I I I E L
P W B R D S L N T
E E S M T P L G M
R H L T O
C A H D
A Y E
GIGI Y Y N 80 Y 0 24 N
LA30 N N N 72 N 1 N/A N
LA34 Y Y N 132 N 0 N/A N
LA36 Y N N 132 N 0 N/A N
LA38 Y Y N 132 N 0 N/A N
LA120 N Y Y 132 N 0 N/A N
LA180 N Y Y 132 N 0 N/A N
LN01S Y Y Y 80 N 0 66 N
LN03 Y Y Y 80 N 0 66 N
LT33 N N N 72 N 1 N/A Y
LT35 N Y Y 72 N 1 N/A Y
TTY N N N 72 N 1 N/A Y
TTY33 N N N 72 N 1 N/A Y
TTY35 N Y Y 72 N 1 N/A Y
VK100 Y Y N 80 Y 0 24 N
VT05 N Y N 72 Y 2 20 N
VT06 N N N 72 Y 1 25 N
VT50 Y Y N 80 Y 0 12 N
VT52 Y Y N 80 Y 0 24 N
VT61 Y Y N 80 Y 0 24 N
VT100 Y Y N 80 Y 0 24 N
VT101 Y Y N 80 Y 0 24 N
VT102 Y Y N 80 Y 0 24 N
VT103 Y Y N 80 Y 0 24 N
VT125 Y Y N 80 Y 0 24 N
VT131 Y Y N 80 Y 0 24 N
VT180 Y Y N 80 Y 0 24 N
VT185 Y Y N 80 Y 0 24 N
VT200 Y Y N 80 Y 0 24 N
VT220 Y Y N 80 Y 0 24 N
VT240 Y Y N 80 Y 0 24 N
VT300 Y Y N 80 Y 0 24 N
VT320 Y Y N 80 Y 0 24 N
VT330 Y Y N 80 Y 0 24 N
VT340 Y Y N 80 Y 0 24 N
The page length is set by default for video terminals
only. Therefore, the notation N/A (not applicable)
appears in the table under LENGTH for hard-copy
SET TTY arg
Sets a characteristic for your terminal.
SET TTY NO arg
Deletes a characteristic for your terminal.
Where: arg is the characteristic that can be set by this
command. The arguments to SET TTY are listed below.
NO turns off the bits set by the argument it
accompanies. For example, SET TTY LC sets lowercase
capability. SET TTY NO LC turns off lowercase ability.
The word SET is an optional portion of the command
ALTMODE Converts the ALTmode codes of 175 and 176 to
the ASCII standard ESCape character 033. NO
ALTMODE restores the individual identities of
the codes 175 (right brace: }) and 176
BLANKS Controls the output of blank lines. NO
BLANKS suppresses the output of consecutive
RETURNS. This is useful for display
terminals, because NO BLANKS will conserve
space on the screen, allowing more output to
be displayed at one time.
COPY Controls the output of the ESCape character
to a VT5x terminal. See the VT52 Owner's
CRLF Controls the automatic carriage return and
line feed at the end of the line. Used with
the WIDTH argument, CRLF gives an automatic
carriage return/line feed at the edge of the
terminal screen. NO CRLF will cause lines
wider than the set WIDTH to be truncated.
The default setting varies according to the
DEBREAK No longer supported.
DEFER Suppresses echoing to a video terminal until
output to the terminal is finished. This is
used when you type characters before the
output is finished. DEFER hold the
characters until the program requests input;
NO DEFER allows them to be echoed on your
terminal as soon as normal output is
DISPLAY Notifies the system that the terminal you are
using is a display terminal. Programs use
this information to control output to the
ECHO Controls echoing on the terminal. NO ECHO
suppresses echoing of all characters you
EIGHTBIT Enables the terminal to accept and generate
eight bit characters. A terminal set with
the EIGHTBIT switch will be able to
communicate with a program that uses seven
ELEMENT nnn No longer supported.
FILL n Assigns filler class n to the terminal. Some
terminals require one or more filler
characters to be sent following certain
control characters such as line feed (LF) and
horizontal tab (HT). With the DN87S
front-end, there will be a short time lapse
before each character is sent.
The number of fillers sent for each character
and the filler class are listed below. The
filler characters are CR (carriage-return),
and DEL (DELETE or RUBOUT) for all other
No fillers are supplied for image mode
output. The default is determined by the
declared terminal type.
Character Octal Number of Fillers for Filler Class
Name 0 1 2 3
BS 010 0 2 6 6
HT 011 0 1 OR 2 0 1 OR 2 (1)
LF 012 0 2 6 6
VT 013 0 2 6 6
FF 014 0 12 21 21
CR on output 015 0 1 3 3 (2)
automatic CR (3) 0 2 4 4
CRLF on output 015-012 0 3 9 9 (4)
XON 021 1 1 1 1
TAPE 022 1 1 1 1
XOFF 023 1 1 1 1
NTAP 024 1 1 1 1
(1) 1 if 0-3 spaces to tab stop; 2 if 4-7 spaces to tab stop.
(2) Output only; no fillers on input.
(3) See the SET TTY CRLF command description.
(4) Sum of the fillers output for a CR and LF.
FORM Controls the output of line-feeds for the
formfeed and vertical tab characters. NO
FORM instructs the system to output the
line-feeds. FORM is a declaration that the
terminal has the capability of generating the
line-feeds. The default is determined by the
declared terminal type.
GAG Controls the reception of messages that were
sent with the SEND command. GAG instructs
the system to prevent messages from reaching
the terminal when the job is at user level.
NO GAG allows messages to reach the terminal
at any time. The default setting is GAG.
HOLD Controls the use of the SCROLL key on VT5x
terminals. See the VT52 Owner's Manual for
instructions on the use of this key.
IGNORE Sets input speed to 0, making terminal
ISO Controls compatibility with ISO
(International Standards Organization)
Latin-1 supplemental graphic character set.
NO ISO means DEC Multinational Character Set.
To display the current setting, you must use
the command INITIA ATTRIBUTES.
LC Controls the translation of lowercase letters
to uppercase letters. NO LC allows all
characters to be translated to uppercase by
Frequently, it is convenient to have a
terminal with both uppercase and lowercase
simulate the behavior of one with uppercase
only. TTY NO LC causes the monitor to
perform this simulation. The echo sent back
by the monitor always matches the case of the
characters after translation. By looking at
the output, you can determine whether
translation was performed by the monitor.
The default condition is determined by the
declared terminal type.
LENGTH n Defines the number of lines of your terminal
page. To stop output on your terminal after
a page of length n, use the arguments STOP or
SBELL, SSTOP, STOP, XONXOF will use this
value as the page length.
LOCALCOPY Controls echoing to the terminal. Local-copy
terminals (terminals that automatically print
each character as you type it) do not require
that the system echo characters to the
terminal. NO LOCALCOPY is the default
setting. Use LOCALCOPY for a local-copy
OVERSTRIKE Indicates the terminal allows a
three-character sequence to create one
composite output character by printing one
character, backspacing, and then printing
another character over the first. To display
the current setting of this attribute, you
must use the command INITIA ATTRIBUTES.
PAGE n Defines the number of lines on your terminal
page, enables recognition of CTRL/Q (XON) and
CTRL/S (XOFF) and stops output to your
terminal after n lines. That is, TTY PAGE n
is the same as TTY LENGTH n XONXOF STOP. The
default value of n is determined by the
declared terminal type. TTY PAGE and TTY
PAGE 0 have the same effect as TTY XONXOF.
For help on CTRL/Q and CTRL/S, see the help
files CTRLQ and CTRLS.
This argument is useful for display terminals
because it prevents output from scrolling off
the screen. When output is stopped by the
system after n lines, the terminal bell
rings. Use CTRL/Q to continue output to your
QUOTE Causes a ^V (control-V) and character to
behave as a single super-quote character.
They will not echo separately, and a single
delete erases them both. NO QUOTE is the
REMOTE Clears the "local" access characteristic for
your job. REMOTE is not recommended for use
by non-privileged users because the action
can be reversed only by an operator [1,2].
The monitor does not allow CTY: to be set
REMOTE. NO REMOTE sets your terminal so that
you can log into an account that requires
local access. For specific information on
account characteristics, including local and
remote access types, see the description of
REACT in the TOPS-10 Software Installation
RTCOMPATIBILITY Disables the CTRL/R and CTRL/T features. NO
RTCOMPATIBILITY is the default argument. For
more help, see the help files CTRLR and
SBELL Sets the terminal to ring the bell when
output is automatically stopped (this is the
default action). NO SBELL suppresses the
SLAVE Specifies that the terminal becomes slaved,
so that no commands can be typed on the
terminal. This is useful for terminals that
are ASSIGNed by another job. This command is
not recommended for use by non-privileged
users because the actions can be reversed
only by an operator [1,2], using NO SLAVE.
SPEED m n Sets the terminal transmitting speed to m and
the receiving speed to n. To set the same
transmitting and receiving speed, use the m
argument alone. You must adjust the speed of
your terminal to match m and n using switches
on your terminal.
NO SPEED is an invalid argument.
Certain hardware configurations do
not allow transmit and receive speeds
to be different (also called "split
SSTOP n Ignores CTRL/Q until output is stopped either
automatically by the system, or by CTRL/S
from user. The page length n is optional.
STOP n Stops output to the terminal automatically
after n lines. The page length n is
optional. When you type CTRL/Q, the page
length counter is reset to 0.
TAB Specifies that this terminal has hardware TAB
stops every eight columns. The default is
set according to the declared terminal type.
When you use NO TAB, the monitor simulates
tabs by sending the necessary number of SPACE
TAPE Causes CTRL/S and CTRL/Q to stop and start
the paper tape reader on a Teletype. See the
TOPS-10 Monitor Calls Manual. NO TAPE, the
default, causes CTRL/S and CTRL/Q to stop and
resume output from the system to the
TIDY No longer supported.
TYPE nnnn Sets terminal characteristics defined by the
declared terminal type (nnnn).
For a list of the terminal types recognized
by the system, type:
The output from HELP * includes a list of
supported terminal types.
TTY is a generic terminal and is the default
for terminals whose types have not been
The characteristics that are set by declaring
the terminal type are:
TYPE is not a necessary portion of the
command string. For example, you can set
your terminal type to that of an LA120 by
typing SET TTY LA120.
UC Equivalent to SET TTY NO LC. Translates all
lowercase letters to uppercase. NO UC is
equivalent to SET TTY LC.
WIDTH n Sets the terminal width (the length of the
line) to n characters. This command combined
with the SET TTY CRLF command enables you to
specify the widest possible margin for your
terminal. The default setting is determined
by the declared terminal type.
XONXOF Allows you to use CTRL/S (XOFF) and CTRL/Q
(XON) to stop and resume system output to the
terminal. This is the default. NO XONXOF
prevents the system from recognizing CTRL/S
Leaves your terminal at monitor level.
Does not require LOGIN.
The SET TTY (or TTY) command is not available to batch jobs.
INITIA displays the TTY parameters
Tell the system that your terminal is a VT340.
.SET TTY VT340 <RET>
Issue the INITIA TTY command. The system responds with the
terminal characteristics of a VT340 terminal.
.I TTY <RET>
RL353A DEC10 Development 16:02:49 TTY162 system 1026/1042/1322
Connected to Node KL1026(26) Line # 162
TYPE:VT340 MODEL:VT340 CLASS:VT300 APC:HARDWIRED
ECHO WIDTH:80 LENGTH:24 NOSTOP
FILL:0 LC TABS NOFORM
CRLF NOGAG SBELL DISPLA
NOTAPE BLANKS NOALTMOD NORTCOMP
NOREMOTE XONXOF NOUNPAUS NOESCAPE
NOEIGHTB NOQUOTE IDLEDI:0 EDITOR