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American Standard Code for Information Interchange


Base two number systems - has two symbols => 1 and 0

Binary code

A base-2 number system that uses two digits, 0 and 1.

Binary digit

either 0 or 1 in binary notation


smallest piece of information used by the computer. Derivied form "binary digit". In computer language, it is either a one (1) or a zero (0).


A series of of bits used to encode a letter, number, or a special characte; usualy has 8 bits


A single letter, digit, or special symbolsuch as ?, #, or *.


A device used to accept, process, store, and get information.

Digital Informaton

information that is in the format that the computer reads which is 0's and 1's

Disk Drive

The device used to store data on a disk and to read what is stored on a disk.

Expansion slot

A connector inside a computer designed to allow a user to add printed circuits boards.

Floppy disk

a reusable magnetic storage medium that uses a thin mylar circular disk as the storage surface.


To prepare a disk so that data and programs can be stored on it by particular computer system.


One billion bytes (or charaters).


Pictures or illustrations on a page.

Hard copy

Output that is printed on paper.

Hard Disk

A rigid disk, usually metal, encased in a hard disk or in a plastic case or cartridge


The physical parts that make up a computer system for example Keyboards, printers, monitors, and so on.


The step in the data processing flow during which data is collected and entered into the computer.

Integrated circuits

Circuitry whose parts are etched together on a small silicon chip less than one-fourth of an inch square.


An input device that usually has keys like those on a typewriter.


storage units


One million bytes


A measure of speed, one million cyclesper second.


A place to store information; usually coded in a binary format; see RAM ROM.


The main processing unit of a computer or information processing device; the "brains" of the machine carrying out instructions, performing calculations, and interactions with the components used to operate the computer. Handles the fetch , decode and exxecute steps of the computer.


A computer output device that uses a display screen to present the processed information.


The main circuit board of a computer housing the microprocessor and providing the means of connecting all the components that make up the computer.


A computer input device used as a pointing and drawing instruments by selecting specific positions on the monitor display.


The computer generated informations that is displayed to the user in some discernible form such as a screen display, printed page, or sound.

Peripheral device

A device that is attached to the computer and aids in input and/or output


The smallest unit on a display screen grid that can be stored displayed or adressed

Primary storage

The computer's immediate internal memory, RAM and ROM


A machine that prints characters or other images on paper.


The second step of the data processing flow in which the computer acts on data.


The set of instructions needed to accomplish a given task.


Random access memory


Read only memory


A machine that changes images from paper or photos into digital formthat the computer can use.

Secondary Storage

Storage that is not involved in the processing of information. This type of storage is used to maintain the digital information for later use. Includes such storage devices as disk, tapes, and CD's

Silicon chip

A small piece of silicon on which circuits are etched.

Soft copy

A temporary display of out put seen on a monitor.


Programs, or instructions, that tell a computer exactly what to do.


A solid device that controls electric curent flow with out using a vaccum tube.

Vacuum tube

Glass bulbs like light bulbs that electricity passes through. They can be found in old radios and TV's

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