GCSE ICT REVISION CARDS

CARDS FOR COVERAGE OF GCSE LONG COURSE ICT.

HideShow resource information
  • Created by: Shagana
  • Created on: 18-05-09 18:03

DATA AND INFORMATION SYSTEMS

  • Data is raw facts and figures. The sorting and processing is called data processing this makes the data have meaning.
  • The data with meaning is called Information

Data----Data Processing---Information

  • All tasks can be broken down

Input---Process---Output

  • Manual information systems: e.g a telephone directory - slow and unreliable
  • Computerised information system: e.g School managing system - flexible and faster.
1 of 11

ADVANTAGES - COMPUTERISED SYSTEM

  • Lots of filing cabinets are uneeded - a single computer can store all the information
  • Many people can access the information with terminals anytime.
  • Data entered only once can be used for many things
  • System can be used with wordprocessors to send mail
  • Information can be transferred in many ways, e.g optical mark reader, keyboard, plotter ect.
  • All aspects of administration can be done
2 of 11

DISADVANTAGES- COMPUTERISED SYSTEM

  • Everything depends on the computer's system, if there is a power cut, virus or system break down and alternative system needs to be used
  • To use the computerised system the staff need to be trained, and when they leave or retire, new staff need to be trained.
  • Security will need to be provided so data can be kept safe, so it can't be misused.
3 of 11

HARDWARE AND SOFTWARE

  • Hardware, the hard parts of the computer you can touch and handle, its a collective name given to the parts which make up the computer system.This includes:
  • Input device (used to get data into the computer)
  • CPU (Central processing unit) (Computers brain)
  • Backing storage (disk drives used to store data when power is off)
  • Output devices (printers moniters ect. provide output in forms of display sound printouts ect. )
  • Software is the name used for actual programmes that allow the hardware to work and do a usefull job. Its made up of a series of instructions that tell the computer what to do.
4 of 11

WHY USE COMPUTERS

  • Computers are fast
  • Computers are accurate
  • Computers keep large amounts of information in small spaces
  • Computers can work 24 hours a day
  • Computers can do some jobs that are imposiible without them
5 of 11

WHY NOT TO USE COMPUTERS

  • Computers can replace people
  • Computers hold personal information that can be misused
  • Staff need to be trained
  • Computers can break down and problems can arise when they can't be used.
6 of 11

PROCESSING DATA

  • Data can be processed in many ways
  • calculating
  • sorting
  • searching
  • storing
  • drawing

The CPU

  • The control unit
  • Arithmetic and logic unit
  • Immediate access store
7 of 11

INPUT DEVICES

  • To get data into a system
  • Keyboard
  • Concept keyboard
  • Mouse
  • Tracker ball
  • Touch sensitive pad
  • Joystick
  • Light pen
  • Touch screen
  • Magnetic stripe reader
  • Graphics tablets
  • Barcode readers
  • Optical character recognision OCR
  • Magnetic ink character recognition MICR
8 of 11

MORE INPUT DEVICES

  • Optical mark reader
  • Punched cards
  • Kimball tag
  • Voice recognition
  • Microphone
  • Video digitiser
  • Electronic point of sale (EPOS)
  • Electronical fund transfer at point of sale (EFTPOS)
  • Scanner
  • Digital camera
  • Web cam
9 of 11

OUTPUT DEVICES

  • Provide results in suitable form after data proccessing. This can be in the form of a printout or a screen display
  • Moniters
  • LCD screens
  • Graphical display units
  • Laser printers
  • Inkjet printers
  • Dot matrix printers
  • Colour printers
  • Graph plotters
  • Voice output
  • Robots
10 of 11

STORAGE OF DATA

  • Memory main store there are two types
  • read only memory ROM

-Its contained in a chip inside the pricessor, to hold data which cannot be changed by the user, its data that comes with the computer when it is manufactured

  • random access memory RAM

-it can be randomly accessed and deleted and modified

11 of 11

Comments

No comments have yet been made

Similar ICT resources:

See all ICT resources »See all resources »