Epson 486SX - Manual (Page 81)

The speed setting remains in effect until you press the
RESET
button or turn off the computer, or until you change it again
using the Setup program, another keyboard command, or the
ESPEED program, described below.
Using the ESPEED Program
ESPEED provides an easy way to change the processor speed if
your application program does not recognize the key
commands or if you
want
to include the program command in
a batch file.
The ESPEED program is on the Reference diskette. If you
have a hard disk drive, copy the file ESPEED.EXE from your
Reference diskette onto your hard disk-if you have not
already done so-and run the program from there. If you do
not have a hard disk, insert your Reference diskette in drive A
and log onto drive A before you enter the command to start the
program.
To run the ESPEED program, type the following at the MS-DOS
command prompt and press
ESPEED
You see the following messages:
Usage: ESPEED[/H] [/L] [/A]
/High set High speed (no auto)
/Low
set Low speed (no auto)
/Auto set Auto speed
These messages tell you the switches you should use to set
the
speed to high, low, or automatic. At the MS-DOS prompt, type
the ESPEED command again and include the appropriate
switch, such as the following:
ESPEED /A
Enhancing System Operations 4-5