topic 2

topic 2

Computer hardware
1. Input devices
  1. Microphone
    1. A microphone inputs speach
  2. keboard
  3. Mouse
  4. Trackball
  5. Games controller
  6. Light pen
2. Output devices
  1. Speaker
    1. A speaker outputs sound
  2. Monitor
    1. A monitor gives the computer system something to display images on but the monitor had no GUI it would be useless
  3. Printer
    1. there are many types of printers including dot matrix, ink-jet, laser and 3D printers
3. Secondary storage
  1. Seconadary storage is a non volatile disk space and is also known as auxilliary memory
  2. Some secondary storage is external to the computer
  3. Secondary storage is commonly used for storing item long term such as photos, memorys or videos
4. The CPU and performance
  1. There are may things that determines the CPUs performance
    1. Clock speed
      1. Computers can only do one thing at a time. It may appear that many things are happening simultaneously, for example you may be listening to music while writing an essay and also downloading some software in the background. In reality, the computer can only process one instruction at a time. It is just the machine is so fast, to you, everything seems to happen at once.
    2. Amount of cores
      1. A CPU can contain one or more processing units. Each unit is called a core. Using multiple cores means that the job in hand is shared between the two CPUs However, doubling the number of cores will not simply double a computer's speed. CPU cores have to communicate with each other through channels and this uses up some of the extra speed. Also many applications have not been written to take advantage of extra processors. Clock speed
    3. Processor type
    4. Cache size
5. The fetch decode execute cycle
  1. 1 fetch
    1. The CPU first has to fetch the instructions and the data from main memory
  2. 2 decode
    1. The next step is for the CPU to make sense of the instructions it has just fetched. This process is called ‘decode'. The CPU is designed to understand a specific set of commands. These are called the instruction set of the CPU. Each make of CPU has a different instruction set. The CPU decodes the instruction and prepares various areas within the chip in readiness of the next step.
  3. 3 excecute
    1. This is the last step of this process it is where the CPU actually does what the user told it to do The instruction is carried out upon the data (Executed). The result of this processing is stored in yet another register.Once the execute stage is complete, the CPU sets itself up to begin another cycle once more.
6. The mother board
  2. CPU - CPU is the abbreviation for central processing unit. Sometimes referred to simply as the central processor, but more commonly called processor, the CPU is the brains of the computer where most calculations take place.
7. Binary logic
  1. Not gate
    1. Not logic table
  2. And gate
    1. And logic table
  3. Or gate
    1. Or logic table
8. ROM and RAm

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	Created by Rhys newlove almost 9 years ago