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HARDWARE AND OPERATING SYSTEMS (Computer networks (A computer network is a…

- - - - Notice that to increase the level you have to multiply the units on the left by 1024 and the units on the right by 1000
- - - - The clock rate sets the pace at which processes are completed.The clock continously generates electrical impulses.
      - A microprocessor power also depends on its cache memory and the speed at which it communicates with the RAM
  - - - The computer main memory is its RAM(random access memory)
        When we run an application its instructions and data are copied to this memory so that the microprocessor can use them .
        This is because acceasing the hard disk is very slow.
        Since RAM doesnt retain information when the computer is switched off we must save our work to the hard disk before we close the appication Otherwise well lose our work
    - - RAM cannot work at the same speed as the microprocessor so a much faster memory is installed between the RAM and the microprocessor:the CACHE MEMORY
      - ROM BIOS
        
        When you turn on your computer it automatically checks the system.
        This initial check is carried out using instructions stored in a special readonly memory:the ROM BIOS
  - - - How do the mouse and keyboard communicate with the microprocessor?
      - Inside the computer youll find a large board we call it the motherboard.All the other components of the computer are connected to it
    - - Using an expansion slot on the motherboard to connect a soundcard
      - By special connectors on the motherboard for such devices as the hard disk DVD drives and so on
      - Using the external ports on the side or back of the computer for example the USB port
- - - - Manages the micriprocessor.If several applications are open at the same time the operating system calculates how much time the microprocessor should give to each one
      - Manages the memory and storage systems,making space available for the different applications
      - Provides an interface or working enviroment for the user
      - Allows communication between applicatitons and peripheral devices