CHAPTER 7 : INPUT AND OUTPUT

Introduction

Competent and users need to know about the most commonly used input devices, including keyboards, mice, scanners, digital cameras, voice recognition, and audio-input devices. Additionally, they need to know about the most commonly used output devices, including monitors, printers and audio-output devices.

Input

Input devices are hardware used to translate words, sounds, images and actions that people understand into a form that the system unit can process. For example, when using a word processor , you typically use a keyboard to enter text and mouse to issue commonds. In addition to Keyboard and mice, there are wide variety of others input devices. These include pointing scanning image capturing and audio-input devices.

Keyboard Entry

Most keyboards use an arrangement og keys given the name OWERTY. This name reflects the keyboard layout by taking the letters of the first six alphabetic characters found on the top row of keys displaying letters.

keyboard

PDA keyboards

Keyboards Features

Ergonomic keyboard

Keyboards

There are wide variety of diffrent keyboard designs.

1.  Traditional Keyboards - Full sized,regid , rectangular keyboards that include function, navigational and numberic.

2.  Ergonomic Keyboards - Similar traditional keyboards. However is not rectangular and a palm rest is provided.

3.  Wireless Keyboards - Transmit input to the system unit through the air. It's flexibility.

4.  PDA Keyboards -  Miniature keyboards for PDAs and smart phones to send email, create documents and more.

5.  Virtual Keyboards - Display an image of a keyboard on a touch screen .