Commodore 64 User Manual page 36

RETURN
RETURN WITH SHIFT:
COMMUNICATION BLOCKED
Pressing the RETURN key while holding down
the SHIFT key has a different effect. This com
bination of keys moves the cursor to the
beginning of the next line without telling the
computer that the previous line is ready to be
interpreted. In other words, the message is not
sent to the computer. You might want to do
this when you are experimenting with differ
ent graphics characters to draw a picture and
haven't changed some of the lines into BASIC
commands yet for your computer to under
stand. Use SHIFT plus RETURN whenever you
wish to move to the beginning of the next line
without the previous line being sent to the
computer.
Try this procedure now. Move the cursor back
up to the PRINT Tl line.
SCREEN 1
Then, hold down the SHIFT key and press
ETURN. The answer does not change this
time.
SCREEN 2
Now, type your name and press only the
RETURN key. An error message appears on
the screen, indicating that the computer didn't
understand your name as one of the com
mands it knows.
SCREEN 3
Try typing your name again, but this time,
hold down the SHIFT key while you press
ETURN. The cursor moves to the beginning
of the next line, and no error message appears.
SCREEN 4
Before going on to the next exercise, clear
the screen by holding down a SHIFT key and
pressing the CLR/HOME key.
SCREEN 1
To see the effect of SHIFT with RETURN,
move the cursor to the command line.
_
SCREEN 2
SHIFT plus RETURN does not send the
command to the computer.
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SCREEN 3
When the computer receives an unfamiliar
command. It displays an error message.
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SCREEN 4
Use SHIFT wfth RETURN to move down a
line without sending a command.