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Chapter 5. Programming considerations
18
Scroll Option
5-44
If the Scroll option is on in the unformatted page and the cursor in the
bottom line of the page, the page data scrolls up when
•
The following character is received from the host program or
entered from the keyboard.
-
CR with Auto Line Feed is on
-
LF, VT, or FF
HT (or Tab Key) at the last tab stop position (Line Wrap
option is on).
•
The Next Line command or the Index command is received.
•
Line Wrap option is on, the cursor is at the last character position of
the page, and an additional character is received from the host
program or entered from the keyboard.
If the Scroll option is enabled in the unformatted page and the cursor in
the top line of the page, the page data scrolls down when:
•
The Reverse Index command is received.
•
The Back Tab key is pressed or the Back Tab command is received.
When the page data scrolls up or down, the top or bottom line in the
page disappears, and a new line is created. The cursor moves to the
newly created bottom or top line.
Notes:
1.
When the page is formatted, the Scroll option is automatically
assumed to be off.
2.
This option may be set independently for each partition.
3.
The ASCII LF option is assumed to be off.
In the formatted page, the last field continues from the last character
location to the first character location in the page until it is terminated by
a field attribute character.
!f the Scroll option is off in the unformatted page, the page terminates at
the last character position of the page.
The following figure illustrates the relationship between the Scroll option
and the Wrap function.
Unformatted page
Scroll Up
t
1
Scroll:Jump or
Smooth
Formatted page
L---------o
Scroll :
Off
Field
Wrap
0----- -
----1-
-
Legend:
•
Current Cursor Address (CCA)
o
Field Attribute (FA)
Cursor stops here
when data is displayed
at the end of the page.
(
(
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