Epson Apex 20020 - Manual (Page 146)

2. Some programs work at only one operating speed. Your
computer can run at either 8 MHz or 12 MHz. Check your
software manual to see if your application program must
run at the slower speed and change the CPU operating
speed if necessary. See “Changing the Operating Speed” in
Chapter 3 for instructions.
3. If you have entered an MS-DOS command that you want
to stop, there are special key combinations you can type to
signal MS-DOS to stop what it is doing. These methods
may also work in your application programs.
To interrupt an MS-DOS command while it is executing,
try one of the following commands:
Hold down Ctrl and press C
Hold down Ctrl and press Break.
4. An application program can occasionally lock the
computer, making it unresponsive to the keyboard. If your
computer does not respond when you type on the keyboard,
you can reset it. Follow the instructions under “Resetting
the Computer” in Chapter 3.
Printer Problems
Below are some general steps to follow if you are having
difficulty with your printer. If the problem persists and you
need more detailed information, check your printer manual.
1. If your printer does not work correctly immediately after
you install it, check that the printer has power and is
properly connected to the computer. Check Chapter 1 of
this manual or your printer manual for instructions on how
to connect your printer to the computer.
Also make sure your printer has paper in it, since many
printers cannot operate without paper.