Epson EL 486UC - Manual (Page 47)

You must turn off the computer and start over. You can reset
the computer using the RESETbutton but you cannot reset the
computer by pressing Ctrl Alt and Del.
Note
If you want to change or delete your password, you must
run the SETUP program as described in Chapter 2.
If you do not remember your password, see “Password
Problems” in Chapter 6.
Changing the Processor Speed
Your computer’s processor can operate at two speeds: fast (the
speed of your microprocessor) or slow (8 MHz). The slow
speed is available to provide compatibility with older
application programs.
When your computer is operating at fast speed, the speed light
(labeled TURBO) on the front panel is on. When the computer is
operating at slow speed, the light is off.
You should use fast 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.
Some copy-protected programs require the computer to run at
slow speed while accessing the program on a diskette. These
programs also usually require you to leave a key disk-the
diskette that contains the copy protection-in the diskette
drive. If you use a copy-protected program, you can change the
speed to slow to access the diskette and return it to fast speed
when you are finished.
3-6 Using Your Computer