Input Devices

                           Input Devices 

This is a part of the computer used oor entering data and program into the computer system. Common examples of input devices are:
1. Keyboard
2. Joystick
3. Mouse 
4. Scanner 
5. Light pen 

 We shall go deep into each of them now. At first we shall discuss on the mouse
1. Mouse 
The mouse can be applied by using the right mouse button and the left mouse button, which perform different functions. 
2. Keyboard
The keyboard is the primary input media for data entry so it only appropriate to be familiar with all the keys and their functions 
The keys on the keyboard are divided into 4 main sections 
I. The main key section 
Ii. The numeric key section 
Iii. The function key section
Iv. The other key section 
3. Diskette 
A diskette is made up of a delicate plastic film disk, covered by a woven cloth which helps to infuse dust from the desk 
Types of diskette 
A. 3.5n or 3 1/2 inch 
B. 5.25n or 5 1/4 inch 
4. Lightpen 
A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT display.
It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy. A light pen can work with any CRT-based display, but its ability to be used with LCDs was unclear (though Toshiba and Hitachi displayed a similar idea at the "Display 2006" show in Japan[1]).
A light pen detects changes of brightness of nearby screen pixels when scanned by cathode ray tube electron beam and communicates the timing of this event to the computer. Since a CRT scans the entire screen one pixel at a time, the computer can keep track of the expected time of scanning various locations on screen by the beam and infer the pen's position from the latest timestamp.

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