Epson equity 320sx plus Benutzerhandbuch

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Entering 
Keyboard Commands
You can change the processor speed by entering one of the
commands shown in the following table.
Speed setting commands
To enter these commands, hold down the Ctrl key and the
Alt key simultaneously and then press the 2, +, 1, or - key.
Use the + or - key on the numeric keypad or the 1 or 2 key
on the main keyboard.
Note
You can use the commands listed above while you are
running a program. However, if the program uses one of
the same commands for another function, you cannot use
it to change the processor speed. For example, if you are
running a program that uses the Ctrl 
Alt 
- command to
move the cursor, you cannot enter Ctrl 
Alt 
- to change the
processor speed to low. Another alternative is to use the
ESPEED program, described below.
The speed setting remains in effect until you press the RESET
button or turn off the computer, or until you change it again
using the SETUP program, another keyboard command, or
the ESPEED program.
4-4 Enhancing System Operations