COM1
The name that MS-DOS uses to identify the primary serial port.
CONFlG.SYS file

A special system file that MS-DOS executes each time you turn on or reset the computer. You use this file to customize your system by installing device drivers, setting limits for files and buffers, and Specifying Ms-DOS commands to be run during startup.

Controller

A hardware component of your computer that manages the operation of the display, hard disk, or diskette drive.

Coprocessor

An optional integrated circuit (chip) that assists the CPU in performing certain numeric calculations faster.

Copy-protected program

A type of program that cannot be copied. Some copy-protected programs require you to leave the program diskette in the diskette drive while you are using it Some also require the cormputer to be running at low speed instead of high speed.

CPU

Central Processing Unit. The integrated circuit (chip) responsible for integrating program instructions, performing calculations, and controlling all input and output operations

CPU speed
The speed which the CPU can execute commands. The Action Note

can run at high or low speed. Also called clock speed, execution speed, or operating speed.