Atari 400 User Manual page 131

The BREAK key is often used to stop the com-
puter while it is doing something. Pressing it
now will only cause the cursor to move to the
beginning of the next line.
SCREEN 1
Then if you press it again, the cursor moves
down to the next line.
SCREEN 2
The BREAK key has a more important use when
running a program. It is used to stop a program
while it is running. You'll see how this works la-
ter in the exercises on using the BASIC language.
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