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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

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Epson 10020 Bedienungsanleitung Seite 225