Apple IIe - Page 279

The 80-Column Board 279
position of the cursor remains unchanged.
CONTROL-K
clear to end of screen
In
order to clear only a specific row, the CONTROL-Z command
is used. When this command is issued, the row in which the
cursor resides is cleared. The cursor position remains un-
changed.
CONTROL-Z clear line
The CONTROL-] command will clear the line in which the cursor
resides
from the current cursor position to the end of that line .
CONTROL-] clear rest of Ii ne
Scrolling the Display
The entire screen display can be scrolled up or down , without
moving the cursor position. If any information is scrolled off
either end of the screen, that test will be lost.
CONTROL-V
CONTROL-W
scroll down
scroll up
Use of CONTROL Codes from BASIC
All of the screen editing features of the 80-column board may be
implemented through BASIC. These features are used by print-
ing the escape or control character. Since the characters cannot
be entered directly into PRINT statements from the keyboard ,
the CHR$ function must be used to generate the control
characters.
The
ESCAPE codes are generally not used in programs because of
their complexity .
The
following example uses the scroll up and scroll down
commands.