Commodore Plus 4 - Page 170

158 Some Programming Techniques
functions cannot be reversed by a cancellation (although in most cases there is
another ESCape key function that has the opposite effect).
Note: If you press the ESCape key and then decide not to press the second key
in a function sequence, the cursor is temporarily frozen until you press any one
key. Obviously you should not press one of the 17 keys that activate an ESCape
function. You also should not press a function key or the CONTROL or Q keys
because they have no effect. Press the space bar or one of the cursor keys to thaw
the cursor and resume normal operations.
Canceling Insert, Quote, Reversed-Image, and Flashing Modes
You can quickly cancel insert mode, quote mode, reversed-image mode, or
flashing mode by issuing the key sequence ESCape O. Although each of these
modes can be terminated by other means, ESCape O is a convenient alternative.
ESCape O is especially useful for turning off quote mode when you need to make
corrections inside quotes.
Note that ESCape O cancels insert mode only when you turn this mode on with
the INSERT key. ESCape O does not cancel automatic insert mode, which is
turned on with ESCape A and canceled with ESCape C.
Cursor-Control ESCape Functions
You can quickly move the cursor to the beginning or the end of the current line by
using the ESCape J and ESCape K functions. ESCape J moves the cursor to the
first column of the current line. ESCape K moves the cursor to the last character
(not the last column) in the current line. If the cursor is already on or past the last
displayed character on the line, ESCape K has no effect on the cursor. ESCape J
always moves the cursor to column 1 regardless of whether or not there is a
character displayed in that column.
If you use ESCape J or K while the cursor is on a BASIC command that takes
up two lines, ESCape J moves the cursor to the first column of the first line even if
the cursor is somewhere on the second line. ESCape K moves the cursor to the last
character of the second line regardless of whether the cursor is on the first or
second line of the two-line command.
Scrolling-Control ESCape Functions
Under normal operating conditions, the screen display scrolls continuously. You
can turn off normal scrolling so that the cursor stops scrolling when it reaches the
current bottom line on the screen. To turn off scrolling, issue the ESCape M
sequence. When scrolling is off, the cursor returns to the top of the screen (in the