Keyboards

Give English equivalents.

Перетворити дані в цифровий код, цикл опрацювання інформації, запустити цикл, збирати дані, підготувати дані до введення, введення даних з клавіатури, вхідне повідомлення (опрацювання запиту), пристрій сканування, клавіатура ПК, відчувати дотик пальця, перетворити в машинний код, зберігати в комірці пам’яті, інший запит, процес введення

1.6 Give Ukrainian equivalents.

Information-processing cycle, office automation technology, satellite communication system, automatic teller machine, computer- based device, fast-food industry, computer-generated image, liquid-crystal display, pianolike keyboard, computer-aided instruction, computer-aided design, floppy disk drive, graphical user interface, long-term storage, fibre-optic cable

1.7 Answer the questions.

1. In what way is an information system activated?

2. What is the primary role of input?

3. What are the two categories of classifying input?

4. What do we call systems using transcribed data input?

5. What are the advantages of direct source input?

6. What devices are used for direct source input?

2.1 Read and translate the following words and word-combination.

Key-switch technology, electromechanical switches, flat-sealed surface, harsh environment, fast-food restaurants, lack of speed, an average rate, a low-average human reading speed, a typewriter layout, a visual aid, a blinking box, a key-driven command.

2.2 Learn key words and word-combinations.

boldface (n) – жирний шрифт

control key – клавіша керування

data-entry terminal – термінал введення

function key – функціональна клавіша

help system – система допомоги

input device – пристрій введення

input system – система введення

keyboard (n) – клавіатура

keyboard template – трафарет клавіатури

layout (n) – розміщення

manual labour – ручна праця

membrane keyboard – контактна клавіатура

mode of operation – режим роботи

numeric keypad – цифрова клавіатура

QWERTY – клавіатура американського типу

set of function keys – набір функціональних клавіш

special cursor key – клавіша керування курсором

word-processing software – програмні засоби опрацювання тексту

2.3 Read and translate the text.

Keyboards are the most widely used in­put devices. Keyboards are found as compo­nents in such input systems as computer terminals, data-entry terminals, cash reg­isters, and telephones.

Construction, uses and layout. Keyboards consist of keyswitch technology coupled with elec­tronic circuitry to encode the data that are entered by pressing keys. Electric typewriters and computers use electro­mechanical switches. Automatic teller machines often use membrane key­boards that have flat-sealed surfaces. Membrane keyboards are more suitable than switches for use in harsh environments. For example, such keyboards are used in fast-food restaurants, where dirt and grease might clog an ordinary key­board.

One major drawback of using a key­board is lack of speed.

There is no standard layout for keyboards. On most of them, you will find the following:

2 A typewriter layout.

3 Function keys.

4 Special control keys.

5 Cursor movement keys.

In the centre of the keyboard is a type­writer layout for traditional entry of text and special characters. The most com­mon layout is called QWERTY, named for the six leftmost characters in the top row of alphabetic characters.

A computer keyboard needs more keys than the typewriter layout, and these are generally found surrounding the typewriter keyboard area. In addi­tion to a numeric keypad, you will find (1) function keys; (2) special keys la­beled [Ctrl] Control, [Alt] Alternate, [Esc] Escape, [Del] Delete, and [Enter] or [Return]; and (3) four cursor move­ment keys to move the cursor up, down, left, and right.

Function keys are labeled with the characters [Fl] through [F12]. The idea behind function keys is to sim­plify the use of application programs. For example, word-processing software often uses the function keys to perform special commands, such as boldface, underline, or delete a sentence or a para­graph. Pressing the [Fl] key brings up a help system in many applications.

Function keys can be used in conjunc­tion with other keys. Holding down the [Alt] key while pressing [Fl], for ex­ample, causes a different command to be executed than pressing the [Fl] key alone. By combining the function keys with the [Ctrl], Shift, and [Alt] keys, a lot functions can be performed.

The Escape key [Esc] is usually used to move from one mode of operation to another. For example, if you have in­structed your word-processing software to print a document and discover that you forgot to set your continuous-form ­feed paper at the top of the form, you may be able to press the [Esc] key to stop the printing, correct the mistake, and then continue. However, different appli­cations might have other uses for the [Esc] key.

The [Enter] key, sometimes called the [Return] key, fulfils two functions depending on the program with which it is used. The [Enter] key functions as a signal to continue in most programs. Pressing the [Enter] key also positions the cursor at the beginning of the next line, which is the electronic equivalent of pressing the carriage [Return] key on a typewriter.

The Control key [Ctrl] is always used in conjunction with one or two other keys to give instructions to a program. For example, when using a word proces­sor, pressing the Dkey causes the char­acter Dto appear on the screen. If you hold down the [Ctrl] key while pressing the Dkey, the word processor might interpret the combination as an instruction to delete a character. The [Alt key is used in the same manner. Cursor movement keys moving the cursor around on the screen is one of the most common tasks in an application program. Acursoris a visual aid on a display screen. It may take the shape of a blinking box or underline, an arrow, or even a pointing finger.

Дата добавления: 2015-01-03