AT&T 610 - Destructive Scrolling

Operations
Page 6- 2
User's Guide
August 1985
With MONITOR MODE option enabled ("on"), received escape
sequences, control characters, and the delete character will be
displayed. LF, VT, and FF will be displayed and will be acted
on as a newline. In the MONITOR MODE, the terminal will always
do an autowrap when the cursor is in the last column and data is
received.
If a display of the data being sent to the line is desired,
the distant receiver must echo that data back to the terminal or
the LOCAL, ECHO option must be "on." If the remote receiver
echoes data back to the terminal and the LOCAL ECHO option is
"on," two characters will appear on the display for each
character sent. There is no provision for sending data from the
screen in block fashion.
Destruct!.ve Scrolling
The display will destruc tively scroll in the interactive
state. With destructive scroll, the display can receive
unlimited amounts of data; however, only the last twenty-four
lines of data will be displayed. A destructive scrolling
routine is used by the terminal to move all the data up or down
one line on the screen and place a new blank line at the bottom
or top of the screen or split screen region. The status line
and the screen label lines do not scroll.
Destruc tive scrolling takes place when a LF, VT, or FF
character or when an index sequence (ESCD) or a newline sequence
(ESCE) is received while the cursor is at the bottom of the
screen OL:, split screen region. If the cursor is at the last
line of th'e screen or split screen region and characters are
received which would overflow the line, an internal newline
operation takes place and the destructive scroll routine is used
~hen the AUTOWRAP option (refer to Section 5) is also enabled.
If the AUTOWARP option is not enabled, the terminal will
continue to receive characters with the most recently received
charac ter being displayed in the last character position until a
LF, VT, or FF character or an index or newline sequence is
received. At that time, a destructive scroll will take place.
Destructive scrolling also takes place when the reverse
index sequence (ESC M) is received at the top of the screen or
split screen region. As a result, all the data on the screen or
in the split screen region will scroll down one line and a blank
line will be placed at the top of the scrolling area.