Atari PC Owner's Manual page 20

The alphanumeric keys (letters, numbers, and symbols) are primarily
used to enter data and commands. They usually function just like
similar keys on a typewriter. The [Shift], [Tab], [Backspace], and
[Caps Lock] keys also perform the same functions as their type­
writer counterparts. Most alphanumeric keys automatically repeat
when they are held down.
Certain keys have special control functions. These keys are [Alt],
[Ctrl], [Del], [End], [Esc), [Home], [Ins], [Num Lock], [Pg Dn],
[Pg Up], [PrtSc], and [Scroll Lock]. Although the functions of
these keys can vary depending on your applications program, the
following key combinations (keys pressed simultaneously) will
usually be in effect:
[Ctrl] [SJ
[Ctrl) [Num Lock]
[Ctrl] [Scroll Lock]
[Ctrl] [Alt] [Del]
+]
[Ctrl] [Alt] [keypad
[Ctrl] [Alt] [keypad-)
[Ctrl] [Alt][<]
>]
[Ctrl) [Alt) [
When a printer is connected to your system you can also use these
key combinations:
[Shift] [PrtSc]
[Ctrl) [PrtSc]
The four [Arrow] keys are generally used within an applications
program to move the cursor in the direction of their arrows (up,
down, left, or right). The cursor is a movable symbol on screen
that marks where the next action will take place.
14
Stops the screen display from scrolling. Press
[Ctrl] [SJ again to resume scrolling.
Pauses the current program or command. Press
any key to continue.
Stops the current program or command and
returns you to the MS-DOS command line.
Restarts your system
Turns on turbo mode, setting the system to high
speed.
Turns off turbo mode, returning the system to
normal PC computing speed.
Turns on audible key click.
Turns off audible key click.
Prints the screen display.
Prints what you type as you type it. Also prints
the screen output (the PC's screen response to
your instructions). Press [Ctrl) [PrtSc] again to
stop printing.