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Текст 3
What can computer do?
The nerve Centre of a microcomputer is the Central Processing Unit or CPU.
This unit is built into a single microprocessor chip – an integrated circuit.
The unit consists of these main parts :
The Control Unit , which examines the instructions in the user’s program
The Arithmetic Logic Unit (ALU) which performs mathematical calculations.
The registers, which are high – speed units of memory used to store and control information.
The program and data which pass through the central processor must be loaded into the main memory.
Most of today’s computers have internal expansion slots that allow users to install accelerations cards or co- processor.

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