Internal command

An MS-DOS command that is stored in the command processor of the operating system; it is not a separate program file. This means that you can execute an internal command without specifying a pathname. Examples include COPY, DEL, RENAME, and DIR. Unlike external commands, internal commands can be executed from any drive or directory.

Jumper

A small device that fits over two small pins on a circuit board to activate a particular function.

Keyboard

A device resembling a typewriter keyboard to enter letters and numbers to the computer.

Kilobyte (KB)

A unit used to measure storage space in a computer’s memory or on a disk. One kilobyte equals 1024 bytes.

Math coprocessor

An optional device that enables the computer to process certain mathematical calculations faster.

Megabyte Text

A unit used to measure storage space in a computer’s memory or on a disk. One megabyte equals 1,048,576 bytes.

Megahertz (MHz

A unit used to measure oscillation frequency (of a computer’s internal timing clock). A megahertz is one million cycles per second. The Apex operates at 4.77 MHz or 10 MHz.

Glossary 9