Epson EL 3S/33 - Manual (Page 38)

To reset the computer, the operating system must be either on
the hard disk or on a diskette in drive A; so if you do not have a
hard disk, insert the system diskette in drive A. Press the RESET
button located on the front left side of your computer. If you
are using DOS, you can also hold down Ctrl and Alt and press
Del.
The screen displays nothing for a moment and then the
computer should reload your operating system.
If resetting the computer does not correct the problem, you
probably need to turn it off and on again. Remove any
diskette(s) from the diskette drive(s). Turn off the computer
and wait 20 seconds. If you do not have a hard disk, insert the
system diskette in drive A. Then turn on the computer.
Changing the Processor Speed
Your computer’s processor can operate at two speeds: high
speed (33 MHz) or low speed (8 MHz). The low speed is
available to provide compatibility with older application
programs.
When your computer is operating at high speed, the TURBO
light on the front panel is on. When the computer is operating
at low speed, the light is off.
You should use high speed for almost everything you do
because your programs will work faster. However, certain
application programs have specific timing requirements and
can run only at the slower speed. See your software manual to
determine if this is the case.
2-6 Using Your Computer