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A general purpose computer has four main sections: the arithmetic and logic unit (ALU), the control unit, the memory, and the input and output devices (collectively termed I/O).
The control unit, ALU, registers, and basic I/O (and often other hardware closely linked with these) is collectively known as a central processing unit (CPU). Early CPUs were composed of many separate components but since the mid-1970s CPUs have typically been constructed on a single integrated circuit called a microprocessor. A laptop (also known as a notebook) is a personal computer designed for mobile use small enough to sit on one's lap.
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