marcel very cool computer science revision

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Marcel Cress
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marcel very cool computer science revision
  1. Topic 3
    1. Hardware
      1. CPU
        1. von Neumann architecture
          1. Control Unit
            1. Decodes instructions received from memory and coordinates the executions of the other components.
            2. ALU
              1. Arithmetic Logic Unit: performs arithmetic and logic operations on data.
              2. Buses
                1. Address Bus: carries address of the location of the memory. Unidirectional.
                  1. Data Bus: carries data between CPU and memory. Bidirectional.
                    1. Control Bus: carries command signals from control unit to other components. Bidirectional.
                    2. Registers
                      1. Provide fast, temporary storage for instructions and data.
                      2. Clock
                        1. Sends electronic signals at intervals to components to synchronise all actions.
                      3. Fetch-decode-execute cycle
                      4. Embedded systems
                        1. Storage
                        2. Software
                          1. Programming languages
                            1. Translators
                              1. Compiler
                                1. All code translated prior to being executed
                                2. Interpreter
                                  1. Each line of code translated one at a time
                                    1. Because the source code is translated line by line while execution is underway, so the program runs more slowly
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