ICT chapter 1

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  • Created by: Zareena
  • Created on: 12-05-13 10:16

ICT Systems:

  • computer = programmable machine that follows set of instructions
  • modern computers electronic, can follow prewritten programm
  • personal computers often connected together in network/internet
    • include netbooks, laptops, notebook computers, palmtops, desktop computers, table computers, PDAs, handhelds
    • often in businesses

Other Types of Computer Systems:

  • supercomputer = fastest computer, often in research departments, for very fast/complex calculations, only one purpose
  • mainframe = computer for processing lots of info in bulk
  • embedded comptuer = computer system in another device
    • e.g. watches, calculator, microwave

Hardware and Software:

  • hardware = physical components
  • software = instructions that run computer
  • hardware:
    • all computers have same basic structure
    • inputs - components for entering data
    • processor - components for interpreting instructions/what to do
    • output - components for showing results from the processing
    • internal/main memory - components to store data or instructions
    • backing storage - components to store data and instructions when computer is off
    • more components, e.g. 
      • network interface card (NIC, provides electronic circuitry to communicate w/ network)
      • router (connect diff. networks, control where data is sent)
      • hub (connects diff. network sections)
      • modem (encodes digintal info to analogue signal, for sending data along telephone lines)
  • CPU (central processing unit) executes all programmes. instructions stored in main memory.
  • main internal memory - holds data currently in use
  • backing storage - holds data for long-term storage



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