Display Control
BACK TAB
From
the
keyboard you
can
move
the
cursor backward to
the
previous
tab
stop
using
the.
and
_ keys (or
the
_ key
in
the
numeric pad).
In
Format
mode,
the
cursor,
if
within
a field, will move to
the
be~inning
of
the
field; otherwise
it
will move to
the
first
character
of
the
previous unprotected field only
(transmit-only
fields
are
ignored).
The
back
tab
feature
is enabled
in
the
User
Key
and
configuration menus.
From
a
program
executing
in
a host computer you can move
the
cursor
backward
to
the
previous
tab
stop
using
the
following escape sequence:
Ec
i
Back
tab
commands received from
the
host when
the
terminal
is
in
Format
mode position
the
cursor to
the
previous unprotected
or
transmit-only field, whichever is encountered first,
if
the
cursor is
at
the
beginning
of
an
unprotected or
transmit-only
field
or
in
a protected field.
When
not
in
Format
mode,
tab
stops
that
do
not lie
within
the
area
bounded by
the
left
and
right
margins
are
ignored by
the
back
tab
function.
The
left
margin
is
treated
as
a
tab
stop. When
the
cursor is positioned
at
or to
the
left
of
the
left
margin,
the
back
tab
function moves
the
cursor to
the
rightmost
tab
stop
in
the
next
higher
line.
Performing a back
tab
with
the
cursor on
the
left
margin
of
the
first
row on
the
screen (or
the
first
unlocked row
if
Memory Lock mode active) will cause
the
text
to roll down one line,
if
there
is
a row above
the
first
row.
DISPLAY ENHANCEMENTS
The
terminal
includes
as
a
standard
feature
the
following display
enhancement
capabilities:
• Inverse Video
•
Underline
Video
•
Blink
Video
•
Half
Bright
•
Security
Video
• Inverse Background
4-22
Black characters
are
displayed
against
a
white
background
.
Characters
are
underscored.
Characters
blink on
and
off.
Characters
(or background, for inverse video)
are
displayed
at
half
intensity.
Character
display is suppressed (this
enhancement
is
used
in
conjunction
with
fields
in
which
passwords,
or
similar
security-sensitive
data,
must
be
entered
through
the
key-
board).
The
entire
screen is white
and
displayed
characters
are
black
(with
this
display
enhancement
enabled,
the
effect
of
the
inverse video function is reversed,
so
as
to produce
white
characters
against
a black background).
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