Epson Progression U12 - Manual (Page 48)

Changing the Processor Speed
Your computer’s processor can operate at two speeds: high
or low. High speed is the highest speed at which your
microprocessor is capable of running, such as 33 MHz. Low
speed simulates an 8 MHz processor to provide compatibility
with older application programs.
You can also set the computer to automatic speed which
switches your computer’s processor from high to low speed
when it accesses a diskette drive.
Note
When your computer is operating at high speed, the TURBO
light on the front panel is lit. It is off when the computer is
operating at low speed.
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.
Using Your Computer 1-29