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Unformatted text preview: tter and better devices. A few examples of efforts made
in this direction are (there may be hundreds of such examples):
1. Originally, the keyboard of a computer was attached to its monitor. But today, nearly
every terminal has a separate keyboard attached to the monitor with a reasonably long
cable so that the user can move the keyboard to any comfortable position on the table or
can even place it on his/her lap during operation. 2. Many new keyboards are designed with tilt adjustments and with hand-rest pads to
make their use more comfortable for the operators.
3. Cordless mouse allows more comfortable operation of mouse device as compared to
4. Originally, monitors used to be fixed at one angle. But today, almost all monitors are
mounted on a ball bearing and can be tilted and rotated to suit the height and angle of
operation of an operator.
5. Monitors with curved screens are being replaced with those having flat screens to
improve readability and reduce reflections.
6. Monochrome monitors are being replaced with color monitors because they are more
comfortable to view. Many operators prefer them and report fewer instances of eye
fatigue and blurred vision.
7. Newer monitors use higher resolution to prevent flicker of displayed objects, which
may lead to eye problems.
8. Newer monitors also use special screen coatings for reducing glare on eyes.
Points to Remember
The input-output devices (abbreviated I/O devices) provide the means of
communication between the computer and the outer world. They are also known as
2. An input device is an electromechanical device that accepts data from the outside
world and translates them into a form the computer can interpret.
3. An output device is an electromechanical device that accepts data from a computer
and translates them into a form suitable for use by the outside world (the users).260
Foundations of Computing
4. Keyboard devices are the most commonly used input devices today. They allow data
entry into a computer system by pressing a set of keys (labeled buttons), whi...
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This document was uploaded on 04/07/2014.
- Spring '14