Technical information
Table
1-1:
Console 1/0 Mode Control Characters
Character
Action
I Retum I also <CR>
~
(rubout)
ICtrl/AI
or
l£E]
Ictrllcl
Ictrllo\
orB
ICtri/EI
Ictri/FI
or
El
Ictrllsl,
[Ij, or m
I Ctrl/H
I,
I!J
(rubout),
or
[ffiJ
Ictrllol
The
carriage
return
ends
a
command
line. No action
is
taken
on
a command
until
after
it
is
terminated
by
a
carriage
return.
A
null
line
termlnated
by
a
carriage
return
is
treated
as
a valid,
null
command. No action
is
taken,
and
the
console
prompts
for
input.
Carriage
return
is
echoed
as
carriage
return,
line
feed
«CR><LF».
When
you
press
0 (rubout),
the
console deletes
the
previously typed
character.
The
resulting
display differs, depending
on
whether
the
console
is
a video or a
hardcopy
terminal.
For
hardcopy
terminals,
the
console echoes a
backslash
(\)
followed by
the
character
being
deleted.
If
you
press
additional
rubouts,
the
additional deleted
characters
are
echoed.
If
you
type
a
non-rub
out
character,
the
console echoes
another
backslash,
followed
by
the
character
typed.
The
result
is
to
echo
the
characters
deleted,
surrounding
them
with
backslashes.
For
example:
EXAMI;E0!!1
NE<CR>
The
console echoes:
EXAMI;E\E;\NE<CR>
The
console
sees
the
command
line: EXAMINE<CR>
For
video
terminals,
the
previous
character
is
erased
and
the
cursor
is
restored
to
its
previous
position.
The
console does
not
delete
characters
past
the
beginning
of
a
command
line.
If
you
press
more
rub
outs
than
there
are
characters
on
the
line,
the
extra
rubouts
are
ignored. A
rubout
entered
on
a
blank
line
is
ignored.
Toggles insertion/overstrike mode for command line editing.
By
default,
the
console powers
up
to
overstrike mode.
Echoes
I\C<CR>
and
aborts
processing
of
a command.
Has
no
effect
as
part
of
a
binary
load
data
stream.
Clears
Ictrllsi
and
re-enables
output
stopped
by
I
cwo
I.
Moves
the
cursor
one
position
to
the
left.
Moves
the
cursor
to
the
end
of
the
line.
Moves
the
cursor
one position
to
the
right.
Recalls
the
previous commands.
Deletes
the
previously
typed
character.
Same
function
as
!!I
(rub
out), above.
Ignores
transmissions
to
the
console
until
you
enter
I CtrilO
I.
Echoes
1\0
when
disabling
output,
which
is
not
echoed
when
it
re-enables
output.
Output
is
re-enabled
if
the
console
prints
an
error
message,
or
if
it
prompts
for a
command
from
the
terminal.
Output
is
also
enabled
by
entering
Maintenance
mode:
press
I Break I
or
enter
I Ctri/C
I.
Resumes
output
to
the
console
terminal.
Not
echoed.
Base System Description
1-5