User`s guide

You can change the processor speed temporarily by entering
one of the following commands from the numeric keypad on
your keyboard:
To select slow speed, press Ctrl Alt -; this turns off the
SPEED light.
To select fast speed, press Ctrl Alt +; the SPEED light comes
on.
Note
You can use the commands listed above while you are
running a program. However, if the program uses one of
these commands for another function, you cannot use it to
change the processor speed.
The speed setting rem ains in effect until you reset your
computer or turn it off.
3-12
Using Your Computer