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 Reference Manual 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 16 MHz, low is 8 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.
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