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III. Read the text and speak about the main features of every computer type.

Digital computers can be divided into six main types, depending on their size and power: they are mainframes, minicomputers, desktop PCs, laptops, notebooks and handheld computers.

Mainframes are the largest and most powerful computers. The basic configuration of a mainframe consists of a central system which processes immense amounts of data very quickly. This central system provides data information and computing facilities for hundreds of terminals connected together in a network. Mainframes are used by large companies, factories and universities.

Minicomputers are smaller and less powerful than mainframes. They can handle multi-tasking, that is, they can perform more than one task at the same time. Minicomputers are mainly used as file servers for terminals. Typical applications include academic computing, software engineering and other sophisticated applications in which many users share resources.

PCs carry out their processing on a single microchip. They are used as personal computers in the home or as workstations for a group. Typical examples are the IBM PC, or the Apple Macintosh. Broadly speaking, there are two classes of personal computers: (a) desktop PCs, which are designed to be placed on your desk, and (b) portable PCs, which can be used as a tiny notebook. This is why they are called notebooks and laptops. The latest models can run as fast as similar desktop computers and have similar configurations. They are ideal for business executives who travel a lot.

The smallest computers can be held in one hand. They are called handheld computers or palmtops. They are used as PC companions or as electronic organizers for storing notes, reminders and addresses.

IV. Read the text again and say if these sentences are true or false. Correct the false ones.

1. Mainframes are multi-user systems – they can be used by many people at the same time.

2. Mainframes are not used for processing large amounts of data.

3. Minicomputers are bigger and more powerful than mainframes.

4. ‘Multitasking’ means doing a number of tasks at the same time.

5. The most suitable computers for home use are minicomputers.

6. Notebooks and laptops are less powerful than desktop computers.

7. Handheld computers are small enough to fit into the palm of one hand.

V. Work in groups: one person chooses the type of a computer, the other asks questions trying to find out what type it is. Finally describe each sort of a computer.