marcel very cool computer science revision

marcel very cool computer science revision

1. Topic 3

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