Epson 500 Series - Manual (Page 33)

If you are using MS-DOS, DOS, hold down Ctrl and Alt and press Delete
to reset the computer. (If you are in Windows, you must press Ctrl
Alt Delete a second time to reset the computer.) The screen goes
blank for a moment and then the computer reloads MsDoG. If
resetting does not correct the problem, you probably need turn
it off and back on a gain.
Turning Off the Computer
Before turning off the computer, save your data and leave the
application program you are using. Make sure the hard disk drive
and the diskette drive lights are off, the turn off the computer by
pressing the power button.
Caution
Always make sure the computer is off when you connect or
disconnect equipment, such as a printer or the trackball.
Changing the CPU Speed
Your computer's processor can operate at two speeds: high or low
(8 MHz). At high speed, the computer performs all tasks faster.
You may need to select low speed, however, to run some
copy-protected programs or a programs or a program that has a specific timing
requirement. You can also use low speed to reduce power
c o n s u m p t i o n .
Whenever you turn on or reset the computer, it starts up in high
speed. To change the speed, you must turn on the Num Lock
feature.
2-8 Using Your Computer