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LEFT
MARGIN
I
=
CURSOR
RIGHT
MARGIN
. -
= CHARACTER MOVEMENT
Figure 4-4. Character Delete With Margins
Clear Display
When format mode is off, pressing the •
key deletes all
displaying and non-displaying characters from the current
cursor position through the end of display memory.
When format mode is on, pressing the •
key deletes all
unprotected displaying and non-displaying characters
(except video enhancement escape sequences) from the cur-
rent cursor position through the end of display memory.
To perform this function programmatically, use the follow-
ing escape sequence:
<ESC>J
Clear Line
When format mode is off, pressing the •
key deletes all
displaying and non-displaying characters from the current
cursor position through the end of the current line.
When format mode is on and the cursor is positioned within
an unprotected or transmit-only field, pressing the •
key deletes all displaying and non-displaying characters
(except video enhancement escape sequences) from the cur-
rent cursor position through the end of the current field. If
the cursor is not within an unprotected or transmit-only
field, the •
key has no effect.
To perform this function programmatically, use the follow-
ing escape sequence:
<ESC>K
Display Control
SETTING AND CLEARING MARGINS
You can redefine the left and/or right margin. These mar-
gins affect the cursor positioning for certain functions
(such as carriage return, home up, home down, etc.) and
establish operational bounds for the insert character and
delete character functions. In addition, the left margin is
always an implicit tab stop. Data to the left of the left
margin or to the right ofthe right margin is still accessible.
Data transfers from display memory to a host computer or
to a printer are performed without regard to margins.
Enabling format mode automatically resets the left and
right margins to columns 1 and 80, respectively.
When you are entering data through the keyboard and the
cursor reaches the right margin, it automatically moves to
the left margin in the next lower line (note that this operat-
ing characteristic can be disabled through the use of the
"I nhEolWrp"
terminal configuration parameter; refer to
Section II). When you press
l1'li,
the cursor moves to the
left margin in the current line if auto line feed mode is
disabled or to the left margin in the next lower line if auto
line feed mode is enabled.
When data is being received from a host computer, it enters
display memory only within the defined margins. When
the cursor reaches the right margin, it automatically
moves to the left margin in the next lower line (as men-
tioned above, this operating characteristic can be disabled
through the use of the
"lnhEolWrp"
configuration pa-
rameter). When an ASCII <CR> control code is received, the
cursor always moves to the left margin.
From the keyboard, you set and clear the margins using the
"margi n/ tab/
co
1"
set of function keys. To get to that set,
use the following keystroke sequence:
II
margin/
tabrcol!
This changes the function key labels to the following:
-
IIDII
.. -
START
SET
CLEAR
CLR ALL
COLUMN
TAB
TAB
TABS
m
- .. -
LEFT
RIGHT
CLR ALL
TABS-
MARGIN
MARGIN
MARGINS
SPACES
To set the left or right margin, move the cursor to the
desired column and then press the appropriate function
key
(m
or
a).
To reset the left margin to column 1 and
the right margin to column 80, press".
If you attempt to set either margin incorrectly with rela-
tion to the other (e.g., the right margin to the left ofthe left
margin), the terminal rejects it with an audible "beep".
4-7
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