The use of the computer for individualized learning and correction whereby the student sits in front of a terminal and goes through a lesson at his own pace. (Unit 17)
CAL (Computer-Assisted Learning)Same as computer-assisted instruction. (Unit 17).
CardSame as punched card. (Units 1, 13)
Card readerAn input device used to read the information represented by holes in a punched card in order to transmit it to the memory of the computer. (Units 1,11)
CartridgeA circular disk called a platter which is about the same size as a long-playing phonograph record, which can be magnetized on both sides. (Units 7,15)
CassetteA specialized audio cassette used to store data. (Unit 15)
Cathode Ray Tube Terminal (CRT)A visual display unit similar to a television screen using an electronic vacuum tube called the cathode ray tube to output data from the computer. (Units 1,17)
Central Procession Unit (CPU)The brain of the computer which consists of three components: the memory, the arithmetic-logical unit and the control unit. It controls and carries out instructions given to the computer. (Units 5, 9)
ChainAn impact printer which is also referred to as a train printer in which the characters move laterally across the pages and as the proper character moves into position, it is hammered onto the paper through a carbon
ChannelSame as track. (Unit 15)
ChipA square or rectangular piece of silicon upon which several layers of an integrated circuit are etched. It is used in microcomputers. (Unit 2)
CircuitA combination of electrical devices and conductors that form a conducting path. (Unit 1)
Circuit boardA board containing integrated circuits which make up the processor, memory and electronic controls for the peripheral equipment of microcomputers. (Unit 8)
ClockA component of the control unit; it produces very rapid electronic timing marks at regular intervals. (Unit 10)
CobolA high-level programming
language which is used for commercial applications. An acronym for Common Business-Orientated Language. (Unit21)
CodeThe representation of information data and instructions in symbolic language. (Unit 21)
Coding sheetsSpecially designed forms on which a program is written before transferring it to an input medium. (Unit 18)
CompileTo interpret a source program or a list of instructions into machine language. (Unit 21)
CompilerA systems program which may be written in any language. It is used to convert a source program into machine code. Each high-level language has its own compiler. (Unit 21)
Computer breakdownFailure of the hardware which necessitates the attention of the service personnel. (Unit 23)
Computer installationIt is a data processing center including the hardware, software, and the buildings and offices necessity for building input/ output media. (Unit 6)
Computer operatorA person who is physically responsible for operating the computer. He arranges tapes and disks. (Unit 23)
Computer scienceThe science of studying the computer, how it functions and how to operate and program it. (Introduction)
Computer systemsThe central processing unit and the peripherals working together as a useful whole constitute the hardware components of a computer system. (Units 4, 5)
ConsoleA typewriter like a machine with a screen which allows the operator to communicate with the computer and get an up-to-date view of the jobs being processed. (Units 7, 9)
ContentsThe information or data which is kept at a particular storage location in memory. (Unit 11)
Control Unit (CU)One of two components of the CPU in digital computers. It transmits coordinating control signals and commands to the computer. (Unit 9)
CoreA small ferrite ring which is capable of being magnetized and demagnetized in the memory of a computer. (Units 1,11,12)
Core memoryA computer memory which is made up of cores. (Unit 12)
CounterA component of the control unit; it selects instructions, one at a time, from memory. (Unit 10)
CRT displaySame as cathode ray tube terminal. (Units 1, 17)
CylinderA stack of tracks on a group of platters in a disk. (Unit 15)
Daisy wheel printerAn impact printer which uses a wheel with up to 100 characters each being on an individual arm, so that only rotation is needed for the hammer to hit each letter. It has superb print quality. (Unit 16)
DataThe information that is inputted with the program, and on which mathematical and logical operations are performed. (Unit 1)
Data bankAll the organized data available to a particular institution. (Unit 22)
Data baseA file of data which is structured in such a way to satisfy the needs of various users and not only one specific application.
Data base managementTo structure and organize data such that the requirements of various users are met without the need to duplicate the data.
Data packDisks with the recording heads sealed inside instead of being attached to the disk drive. (Unit 15)
Data processingHandling or
manipulating information called data which is specially prepared to be understood by the computer. This involves clerical functions as well as
arithmetic and logical operations performed by the computer. (Unit 6) Data processing managerThe person who directs a data processing department. He should have leadership qualities as well as some technical
knowledge of the field. (Unit 23) Decimal systemA number system
any issue. (Unit 4) DeckA stack of cards which constitute
one group, e.g. the punched cards that
make up one program. (Unit 13) DecoderA component of the control
unit; it takes the coded instruction and
breaks it down into the individual
commands necessary to carry it out.
(Unit 10) Dedicated functionA function which is
performed numerous times by a mini
or a micro. (Unit 11) DensityThe number of bytes that can
be stored on one inch of tape. It is
measured by bytes per inch (BPI).
(Unit 4) Desktop publishingUse of a
microcomputer for all phases of
document production, including writing,
graphics and drawings, editing, and
final high quality printing. DeviceSomething invented or adapted
for a specific purpose. (Unit 1) Diamond symbolO °neoftne
symbols on a template used in
flowcharting to indicate that a decision
has to be made. (Unit 20) DigitA number which has only one
character, 0,1,2, 3, 4, 5, 6, 7, 8, or 9.
(Unit 6) Digital computerA computer in which
information is represented by one of
two electronic states: on or off. These
are represented by the two digits 1 and
0 respectively. (Units 2, 6) DiskA storage device which is made up
of one or more circular plates which
can be magnetized on both sides.
Disks can be either floppy or hard.
(Units 1, 15) Disk driveA device which is capable of
transmitting magnetic impulses
representing data from the disk to the
computer memory and vice versa.
(Units 1, 15)
DisketteSame as floppy disk. (Unit 15)
Display screenA visual display unit like a T.V. screen used for the visual output of the data. (Unit 17)
DrumAn impact printer which has a spinning cylinder for each character position in a line, and each cylinder containing all the characters in a character set. (Unit 16)
Dual-densityA screen which has the possibility of showing two different light densities: light and dark. (Unit 17)
Dynamic graphicsGraphics that show movement. (Unit 17)
Electronic cottagePossible future lifestyle featuring microcomputers in the home, used for business work via telecommunication networks, and using television/teletext as a home based information provider.
Electrosensitive printersSame as thermal printers. (Unit 16)
Electrostatic plotterA device which electronically generates patterns of dots in a line across a page to make up a picture. (Unit 17)
ExecuteTo run the instructions of a program after they are changed to the machine code by the compiler. (Unit 20)
ExecutiveA systems program which consists of a number of routines that are kept either partly or totally in the main memory so as to control and supervise certain functions of the computer.
Fibre opticsThe field of
telecommunications which uses instead of copper wires, plastic ribbons containing hair-thin optical fibres made from transparent glass. Sound is transmitted as light pulses instead of electrical signals.
FileA group of blocks which, in turn, is a group of records. (Unit 14)
Fixed-head diskHard magnetic disks are two types: fixed-head and moving-head. (Unit 15)
Fixed applicationA program written to solve one specific problem. (Unit 7)
Floppy diskAlso called diskettes which are made from plastic. They are very light, flexible and inexpensive and are usually used with microcomputers. (Unit 15)
FlowchartA diagram or a sequence of steps which represent a solution of a problem. Arrows are used to show the sequence of events. (Unit 18)
FortranA high-level programming language which is used for mathematical and scientific problems. An acronym for FORmula TRANslation. (Unit 21)