Vax 613 0S Instruction Manual Page 229

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16.3.2 Console Operation
Special keys and signals are used by the console program:
Ctrl/U
Ignores the current command line. The console prompt appears on the next
line. This key sequence affects only the current line. The console program
echoes this as ‘‘^U.’’ Pressing
Ctrl/U
while a command is executing does not
abort the command.
<
x
The Backspace/Delete key deletes single characters within a command
line. On video terminals, the deleted character(s) disappear; hard copy
terminals type a pair of backslash delimiters as the characters are deleted.
For unknown attached console terminals, the console program assumes they
are hard copy terminals.
Return
Terminates the command line, so that the console program can execute the
command.
Ctrl/S
and
Ctrl/Q
Are equivalent to the corresponding line pacing control characters XOFF and
XON. Characters received between the XOFF/XON pair may be ignored. The
Hold Screen
key on the built-in console device is not used for line pacing.
Supported on both the built-in and attached terminals, these keystrokes are
unavailable during system exerciser.
Ctrl/C
Aborts the current command, if the console program has not passed control
to another program, such as an operating system or loadable diagnostic. The
console program echoes this as ‘‘^C.’’
These keystrokes are unavailable during system exerciser.
Ctrl/O
Causes the console to discard transmissions to the console terminal, until the
next
Ctrl/O
is entered.
Ctrl/O
is echoed as ‘‘^O’ when it disables output, but is
not echoed when it reenables output. Output is reenabled if the console prints
an error message, or prompts for a command from the terminal. Output is
also enabled by entering program I/O mode, and by pressing
Ctrl/C
.
The console program prompt is three ‘‘greater than’’ symbols followed by a
space on a new line.
>>>
The character sequence used is 0D
16
,0A
16
,0D
16
,3E
16
,3E
16
,3E
16
,20
16
(which is <CR>, <LF>, <CR>, ’>>>’, <SP>); this character string can be used
by host software executing a binary load operation to the special attached
terminal port to determine when it may respond.
The following rules pertain to terminal input when the system is operating in
console mode:
Commands are limited to 80 characters. Characters entered after the 80th
character replace the last character in the buffer. Characters so lost may be
Console 16–5
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