Input Devices

In this lecture i will try to give introduction to some key input devices.

Keyboard:-

Keyboard is a most widely used input device. it is the normal method to input data in computer memory using keyboard. Normally a keyboard have 102 to 108 keys on it. Alphabets, Numbers and some special characters are printed on these keys. There are many layouts of keyboards. QWERTY layout is commonly used now a days. A keyboard have following sets of keys on it.
Alphabetic Keys:   (A to Z)
Numeric Keys:       (0 to 9)
Function Keys:       (F1 to F12)
Special Keys:         (ALT, CTRL,DEL, SHIFT etc.)
Special function keys:   (PG-UP, PG-DN, END, HOME, DELETE, PRINT Scr etc.)
Multimedia Keys:   (Forward, Play, Pause, Stop, next, etc. and some internet keys)
Arrow Keys:

Mouse:-

Mouse is a pointing device. We control movement of pointer on screen with the help of a Mouse. A typical mouse have 2 buttons and a scroll. Now a days some mouse come with extra multimedia buttons. Pressing a mouse button is called a click. Pressing a button twice is called a double click. Left click is normally used to select objects on screen, while right click is used to open a list of commands (Menu). Scroll is used to move pages up and down. In many latest browsers a click using scroll button opens the link in a new tab.