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When you install MS-DOS, it creates an AUTOEXEC.BAT file
for you. To modify the file or replace it with a new one, you
can use the COPY or EDLIN command, a text editor, or a
word processing program that can save a file as a text-only
file. However, be sure to name the file AUTOEXEC.BAT and
store it in the root directory of the hard disk or diskette from
which you load MS-DOS.
See your MS-DOS manuals for more information about
creating and using batch files.
Changing the Processor Speed
Your computer’s processor can operate at two speeds: high
and low. High speed is 20 MHz, low is 10 MHz. On high, the
computer can access memory faster than on low. Your
processor is set to operate at high speed (by default) in the
SETUP program unless you change the speed to low or set the
speed to change automatically.
NoteNote
When your computer is operating at high speed, theWhen your computer is operating at high speed, the
TURBO
light on the front panel is on, and it is off when
TURBO
light on the front panel is on, and it is off when
operating at low speed.operating at low speed.
You should use high speed for almost everything you do
since your programs will work faster. However, certain
application programs have specific timing requirements for
diskette access and can run only at the slower speed. See your
software manual to determine if this is the case.
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.
4-2
Enhancing System Operations