Epson Progression User Manual page 49

Some copy-protected programs require the computer to run at
low 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 often, you may
want to set your processor speed to change automatically to
low speed when accessing the diskette and return to high speed
when it is finished.
Depending on the type of copy-protected program you have,
you may or may not want to set the processor to automatic
speed. Follow these guidelines:
only on a diskette or that requires a key disk, try to load the
program at high speed. If this works, you do not need to set
the speed to change automatically. If you can't load the
program on high, set the speed to change automatically.
require a key disk but requires a special procedure to install
it on a hard disk, set the speed to low while you are
installing the program. Then set the speed to high while
you load and run the program.
If this does not work, try installing and loading the
program at low speed and then change to high speed to run
it. Do not set the speed to change automatically.
There are three ways to change the processor speed:
1-30 Using Your Computer