The Processor.

The processor is the main part of the computer, it can perform one task at one time but does each very very quickly. It is in the centre of the Von Neumann Architecture, a diagram showing the inputs, outputs, main memory and backing storage of the computer.

Within the processor there other areas: the arithmetic and logic unit, control unit, memory address register, memory data register and other registers.The arithmetic and logic unit carries out all calculations and logical operations. The control unit manages the fetching decoding and executing of instructions. The registers are temporary fast storage locations which hold: data being processed, instructions being processed, and the addresses of the memory locations being accessed. Buses are used to pass information within the processor and to main memory. The main buses are the address bus, data bus and control bus. The address bus carries information from the memory address register to main memory through wires, the more wires the larger the amount of storage locations available. The data bus is different as it can carry information from the memory data register to the main memory and vice versa, increasing the width of these buses means that more data can be carried at once so the computers performance is better. The control bus, each wire does a different thing. The five main wires are: read, write, clock, reset and interrupt.





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