Keyboard

Dear Members,
            Today we are going to share with you first lesson related to Input devices. In this post we will give you knowledge about Keyboard and its uses...

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• Keyboard:-

 

1.      

 The set of typewriter like keys that enables you to enter data into a computer. Computer keyboards are similar to electric typewriter keyboards but contain additional keys. The keys on computer keyboards as follows:-

1.       Alphanumeric keys

2.     Modifiers keys

3.     Navigation and typing keys

                               The standard layout of letters, numbers and punctuation is known as a QWERTY keyboard because the first six keys on the top row of letters spell QWERTY. The QWERTY keyboard was designed in the 1800s for mechanical typewriters and was actually designed to slow typists down to avoid jamming the keys. Another keyboard design, which has letters positioned for speed typing, is the Dvorak keyboard.

• Alphanumeric Keys:-

Alphanumeric, numeric and punctuation keys are used in the same fashion as a typewriter keyboard to enter their respective symbol into a word processing program. The Space bar is a horizontal row is the lower most rows, which is significantly wider than other keys. Its main purpose to enter the space between words during typing. It is large enough so that a thumb from either hand can use it easily.

• Modifiers:-

Modifiers keys are special keys that modify the normal action of another key, when the two are pressed in combination.

For Example:-

<Alt> + <F4> in the Microsoft windows will close the program in an active window. The most widely-used modifiers keys include the Control key, Shift key and the Alt key.

• Navigation and Typing Modes:-

Navigation keys include a variety of keys which move the cursor to different positions on the screen. Arrow keys are programmed to move the cursor in a specified direction. ‘Page Up’ and ‘Page down’ keys, scroll the page up and down. The Home key is used to return the cursor to the beginning of the line where the cursor is located; The End key puts the cursor at the end of the line. The tab key advances the cursor to the next tab stop.