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The movement of existing characters during an "insert
character" editing operation is illustrated in figure 4-3.
When format mode is off, any unprotected, transmit-only,
alternate character set, and/or video enhancement fields to
the right of the cursor move to the right with the dis-
playable characters. If the cursor is positioned within any
such field, the insert character function extends the range
of the field by one position for each character inserted.
Block terminators at or to the right of the cursor position
move to the right along with the displayable characters.
Non-displaying terminators to the right of the cursor also
move to the right along with the displayable characters; a
non-displaying terminator at the cursor position, however,
remains at that position.
Whenformat mode is on and the cursor is positioned within
an unprotected or transmit-only field, the insert character
function affects only those characters from the cursor po-
sition through the end of the current subfield. Block ter-
minators and non-displaying terminators are treated the
same as when format mode is off. If the curE;!or is not within
an unprotected or transmit-only field, it automatically
moves to the first character position of the next subsequent
unprotected field when the first character is inserted.
From the keyboard, you enable and disable the insert char-
acter editing function using the •
key. When enabled,
the characters "IC" are displayed in the status line at the
bottom of the screen.
From a program executing in a host computer, you enable
and disable the insert character editing function using the
following escape sequences:
4-6
ENABLE:
<ESC)Q
DISABLE:
<ESC)R
LEFT
MARGIN
RIGHT
MARGIN
-+
=
MOVEMENT OF
EXISTING CHARACTER
Figure 4-3. Character Insert With Margins
Delete Character
When you use the delete character edit function, the cursor
(
remains stationary, the character atthe cursor position is
deleted, all characters between the cursor and the right
margin move left one column, and a blank moves into the
line from the right margin.
This edit function is meant to be used within that portion of
the screen delineated by the left and right margins. If you
position the cursor to the left of the left margin, the delete
character function works as described above. If you po-
sition the cursor beyond the right margin, however, the
delete character function affects those characters from the
current cursor position through the right boundary of the
screen.
The movement of existing characters during a "delete char-
acter" editing operation is illustrated in figure 4-4.
When format mode is off, any unprotected, transmit-only,
alternate character set, and/or video enhancement fields to
the right of the cursor move to the left with the displayable
characters. If the cursor is positioned within any such field,
the delete character function shortens the range of the
field by one position for each character deleted. Deleting
the first character position of an unprotected or trans-
mit-only field changes the rest of the field to protected.
Deleting characters at the start of, or within, a video
( .
enhancement and/or alternate character set field does
NOT alter the characteristics of the rest of the field. Block
terminators and non-displaying terminators to the right of
the cursor move to the left along with the displayable
characters and are deleted ifthey are at the cursor position
when this function is executed.
When format mode is on and the cursor is positioned within
an unprotected or transmit-only field, this function affects
only those characters from the cursor position through the
. end of the current subfield.
If
the subfield definition also
includes a video enhancement and/or an alternate char-
acter set, those characteristics are NOT altered by the
delete character function. Block terminators and non-
displaying terminators are treated the same as when for-
mat mode is off. If the cursor is not within a protected or
transmit-only field, the delete character function has no
effect.
From the keyboard, each time you press the . . key the
terminal deletes one character. If you hold the key down,
the terminal continues to delete characters until either the
key is released or there are no non-blank characters be-
tween the cursor position and the right margin. In the
latter case, pressing or continuing to hold down this key
has no further effect.
From a program executing in a host computer, you delete
the character at the current cursor position using the
following escape sequence:
<ESC)P
(
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