Computer Organization Part 1

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Presentation transcript:

Computer Organization Part 1

The von Neumann Model • The von Neumann model consists of five major components: (1) input unit; (2) output unit; (3) arithmetic logic unit; (4) memory unit; (5) control unit.

The System Bus Model • A refinement of the von Neumann model, the system bus model has a CPU (ALU and control), memory, and an input/output unit. • Communication among components is handled by a shared pathway called the system bus, which is made up of the data bus, the address bus, and the control bus. There is also a power bus, and some architectures may also have a separate I/O bus.

Levels of Machines • There are a number of levels in a computer (the exact number is open to debate), from the user level down to the transistor level. • Progressing from the top level downward, the levels become less abstract as more of the internal structure of the computer becomes visible.

A Typical Computer System

The Motherboard • The five von Neumann components are visible in this example motherboard, in the context of the system bus model. Source: TYAN Computer, www.tyan.com