Atari 400 User Manual page 62

If you type words or characters that are
not
in
the computer's vocabulary and press RETURN,
the computer won't know what it is supposed
to do. Right now you have a series of letters on
your screen from the previous exercises. But this
series of letters is not a.BAS/C command. Try
pressing the RETURN key. The computer an-
swers with the word ERROR.
It
also displays
whatever characters you typed before you
pressed RETURN.
SCREEN 1
~
Whenever the computer displays the ERROR
message, it also shows you whatever you typed
that it didn 't understand as a command . That
helps you change your message to one the com-
puter can follow.
In the section on using the BASIC language,
you'll
see
what happens when you use the RE-
TURN key to send proper BASIC commands to
the computer.
Though the RETURN key also moves the cursor
to the beginning of the next jine, this is different
from wraparound. RETURN ends a line even if
there is still room for more characters, and the
computer recognizes it as a true line Change.
RETURN also lets you end a line which contains
no characters . Press RETURN again. The cursor
just moves down a line because there was no
message in the previous line to respond to.
SCREEN 2
60