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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