Epson 486SX - Manual (Page 72)

Stopping a Command or Program
You may sometimes need to stop a command or program while
it is running. If you have entered an MS-DOS command that
you want to stop, try one of the following commands:
Hold down the key and press
Hold down the key and press
These methods may also work in your application program.
If not, you may need to reset the computer as described below.
Caution
Do not turn off the computer to stop a program or command
because the computer erases any data you did not save.
Resetting the Computer
Occasionally, you may want to clear the computer’s current
settings or its memory without turning it off. You can do this
by resetting the computer.
For example, if an error occurs and the computer does not
respond to your keyboard entries, you can reset it to reload
your operating system and try again. However, resetting
erases any data in memory that you have not saved; so reset
only if necessary.
Caution
Do not reset the computer as a means to exit a program.
Some programs classify and store new data when you exit
them in the normal manner. If you reset the computer
without properly exiting a program, you may lose data.
Using Your Computer 3-5