Commodore VIC-20 User Manual page 15

Look for this key:
Press the
key and look at the screen.
he cursor was here
when you pressed
the RETURN key.
The VIC typed these.
Pressing the [ BL^^^B j key told the VIC you were finished
typing. The VIC then looked at what you typed, recognized
that it was being asked to do something (actually, you told it
to print something). The VIC then PRINTed everything between
the two quotation marks (RAINBOW).
When the VIC finished PRINTing the word RAINBOW, it let
you know by displaying the READY message and blinking the
cursor.
It's your turn. Go ahead and enter some other PRINT
messages for your VIC to display. Try these or make up your
own: ,,
Remember, hold
the SHIFT down
to get this
character.