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Display Control
From a program executing in a host computer, you set and
clear the margins using the following escape sequences:
SET LEFT MARGIN:
<ESC>4
SET RIGHT MARGIN:
<ESC>S
CLEAR ALL MARGINS:
<ESC>9
The first two escape sequences set the left and right mar-
gin (respectively) at the current cursor position. Therefore,
before using them you will first have to position the cursor
at the desired column using one ofthe cursor control escape
sequences described earlier in this section.
SETTING AND CLEARING TABS
You can define a series of tab stops to which you can move
the cursor using the tab and back tab functions (described
as separate topics later in this section).
From the keyboard, you set and clear tab stops using the
"margin/tab/col" set offunction keys. To get to that set, use
the following keystroke sequence:
II
..
margin/
tabrcol/
This changes the function key labels to the following:
- .. .. ..
START
SET
CLEAR
CLR ALL
COLUMN
TAB
TAB
TABS
.. - ..
DI
LEFT
RIGHT
CLR ALL
TABS-
MARGIN
MARGIN
MARGINS
SPACES
To set a tab stop, move the cursor to the desired column and
then press . . . To clear a tab stop, move the cursor to the
particular tab stop position and then press". To clear
all existing tab stops, press". Note that the left margin
is always an implicit tab stop and is not affected by . . .
'ntb stops that do NOT lie within the area bounded by the
left and right margins are ignored when the tab or back tab
functions are performed.
From a program executing in a host computer, you set and
clear tab stops using the following escape sequences:
SET TAB:
<ESC>1
CLEAR TAB:
<ESC>2
CLEAR ALL TABS:
<ESC>3
The first two escape sequences set and clear (respectively)
a tab stop at the current cursor position. Therefore, before
using them you will first have to position the cursor at the
desired column using one of the cursor control escape
sequences described earlier in this section.
TAB
From the keyboard, you can move the cursor ahead to the
next subsequent tab stop using the •
key.
4-8
From a program executing in a host computer, you can
move the cursor ahead to the next tab stop issuing either an
C·
ASCII
<HT>
control code (decimal 9; Control
"I")
or the
following escape sequence:
. .
<ESC>1
'ntb stops that do NOT lie within the area bounded by the
left and right margins are ignored by the tab function.
Note that the left margin is treated as a tab stop. When the
cursor is positioned at or to the right of the rightmost tab
stop, the tab function moves the cursor to the left margin in
the next lower line. When the cursor is positioned to the left
of the left margin, however, the tab function advances the
cursor to the first explicit tab stop in the line (or to the left
margin in the next lower line if no explicit tab stops are
defined).
BACK TAB
From the keyboard, you can move the cursor backward to
the previous tab stop using the
III
and. keys (or the
. . . key in the numeric pad).
From a program executing in a host computer, you can
move the cursor backward to the previous tab stop using
the following escape sequence:
<ESC>i
Tab stops that do NOT lie within the area bounded by the
left and right margins are ignored by the back tab function.
(
Note that 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.
DISPLAY ENHANCEMENTS
The terminal includes as a standard feature the following
display enhancement capabilities:
• Security Video-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 keyboard).
• Inverse Video-black characters are displayed against a
white background.
• Underline Video-characters are underscored.
• Blink Video-characters blink on and off.
• Half Bright-characters (or background for inverse
video) are displayed at half intensity.
These enhancements may be used separately or in any
combination. When used, they cause control bits to be set
within display memory. If the content of display memory is
(
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