Bar-code reader

Anyone who shops in a modern supermarket will be familiar with bar-code readers. The reader is a penshaped device that is plugged into the computer. At the tip of the reader is an optical sensor that detects printed marks.

Exercise 4. Answer the questions below.

1. What is meant by peripherals?

2. What is the joystick for?

3. What is a cursor and how is it controlled?

4. What's a mouse? What is it for?

5. In what way can a menu item be selected?

6. What is the bar-code reader?

Exercise 5. Choose the right word from the list below.

1. It is wise to make copies of __ at regular intervals when you are typing data into a microcomputer.

2. Always be aware that a disk fault, or even a brief power failure, will lose all the work you have typed in, from the point when you last made a __.

3. Almost all microcomputers have two disk drives, so you can ___ a blank disk in one slot and the full disk in the other to copy it.

4. Some microcomputers use cassette tapes for storing __ and data.

5. Tapes can hold a lot of ___, but are much slower to use than disks.

6. The computer can go immediately to any of the __ data.

7. A tape, on the other hand, is a serial access device from which information can be retrieved only in the __ in which it was recorded.

recorded, information, disks, back-up, order, put, programs

TEXT 7

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