Epson 386SX - Manual (Page 75)

Selecting the Operating Speed
The Equity 386SX can operate at two speeds: high and low.
High speed is 16 MHz and low speed simulates 8 MHz. On high,
the computer can access memory faster than on low.
You will probably use high speed for almost everything you do.
However, certain application programs have specific timing
requirements for diskette access and can run only at the slower
speed. See the manual for your application program to
determine if this is the case.
N o t e
If you enabled the Auto speed function when you ran the
Setup program, the computer automatically slows down to
low speed whenever it accesses a diskette drive. See
Chapter 2 for information on the Auto speed function.
Use the CPU SPEED switch on the front panel to change the
CPU speed; move it left for low and right for high. When the
computer runs at low speed, the power light is orange; at high
speed, it is green.
CPU SPEED switch
WARNING
You do not need to turn off the computer to change the
operating speed, but do not change it while you are running a
program. Complete your current operation, exit the program
to MS-DOS, and then change the speed.
Using the Equity 386SX 3-5