Paper 1, Computer Systems

  • CPU - ensure instructions are correctly processed. Designed using Von Neumann architecture.
  • The Von Neumann architecture replaced single use computers so that devices can do more than one thing at once.
  • MAR - Memory address register, holds the address of the next instruction in memory.
  • MDR - Memory data register, holds the data that has been fetched from memory.
  • PC - Program counter, increments itself by one after every cycle is performed.
  • ACC - Accumulator, holds the results of any calculations from the ALU.
  • ALU - Arithmetic logic unit, carries out/performs calculations.
  • CU - Control unit, controls the timings of all the actions within the fetch-execute cycle and determines where data goes to be carried out or the data that needs to be held


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