A digital computer typically consists of a control unit, an arithmetic-logic unit, a memory unit, and input/output units. The arithmetic-logic unit (ALU) performs simple addition, subtraction, multiplication, division, and logic operations such as OR and AND. The main computer memory, usually high-speed random-access memory (RAM), stores instructions and data.
The control unit fetches data and instructions from memory and effects the operations of the ALU. The control unit and ALU usually are referred to as a processor, or central processing unit (CPU). The operational speed of the CPU primarily determines the speed of the computer as a whole. The basic operation of the CPU is analogous to a computation carried out by a person using an arithmetic calculator.
Monday, August 4, 2008
Basic of Computers
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