Atari 600XL

Stops the TV display when
the computer is writing on
the screen; press CONTROL
1 again to continue.
Sounds a buzzer.
Produces end-of-file (EOF)to
a program reading input
from the keyboard. This is
just like the end-of-file which
happens when a disk file is
being read and the end of
the file is reached. End-of-
file produces an error
unless the program is writ-
ten to TRAP and process the
EOF.
Makes space to insert a pro-
gram line or text line.
Deletes the text or program
line the cursor is on.
Types upper-case charac-
ters without getting compu-
terout of the lower-case or
other type of mode.
Shifts computer between
upper-case and lower-case
character modes. Also,
releases computer from the
CONTROL LOCK mode.
Produces the CONTROL
LOCK mode. Useful when
you must enter a number of
commands combining CON-
TROL with other keys, such
as when creating graphic
characters.
Locks computer in the
upper-case mode for alpha-
betic characters. In this
mode, you must still press
SHIFT to get upper-case
characters on the numeric
and symbol keys.
When used in conjunction
with CONTROL, these keys
move the cursor up, down,
left, and right
Returns cursor to left mar-
gin. Tells computer that
you've finished typing or
editing a line.
Reverse Video turns re-
verse video mode on and
off. In some ATARIpro-
grams, this key is referred
to as the Atari logo ()I\..) key.
Auto Repeat when you
press any key and continue
holding it down, the charac-
ter repeats itself until you
release the key.