1. KEYBOARDS, MICE, AND OTHER INPUT DEVICES PRINCIPALS OF INFORMATION TECHNOLOGY

2. INTRODUCTION OF THE KEYBOARD In the early days, computers accepted input on cards and paper tape. Keyboards appeared back in 1983 Most keyboards today are IB Enhanced AT- Style keyboards Copyright © Texas Education Agency, 2013

3. THE KEYBOARD The keyboard was one of the first peripherals to be used with computers, and it is still the primary input device for entering text data. Some people believe that when computers can understand handwriting and speech, keyboarding will become unnecessary. But for now, keyboarding remains the most common way to enter text and other data into a computer. Question: Does anyone know how many keys are on a standard keyboard? 101 keys arranged in five groups Copyright © Texas Education Agency, 2013

4. KEYBOARDS The standard keyboard layout consists of five different groups of keys: - Alphanumeric keys -Numeric Keys -Function Keys -Cursor Movement Keys -Modifier Keys Copyright © Texas Education Agency, 2013

5. STANDARD KEYBOARD LAYOUT Copyright © Texas Education Agency, 2013

6. KEYBOARDS Long periods of time on the keyboard can cause injuries An ergonomically designed keyboard and good keyboard practices can help prevent some of these injuries Copyright © Texas Education Agency, 2013

7. FUNCTION OF A KEYBOARD KEYBOARD Copyright © Texas Education Agency, 2013

8. MAINTENANCE ON A KEYBOARD Disconnect the keyboard from the computer Vacuum the keyboard to remove any loose dust, crumbs, and/or debris A small brush can loosen some of the material A can of compressed air can also help remove the dust Clean the keyboard with a mild glass cleaner using a cloth and/or cotton swabs Copyright © Texas Education Agency, 2013

9. THE MOUSE Invented by Douglas Engelbart in 1963 A pointing device that moves a graphical pointer on the screen Can be used to issue commands, draw, and input other tasks Copyright © Texas Education Agency, 2013

10. THE MOUSE The mouse first gained widespread recognition in 1984. A mouse lets you position the cursor anywhere on the screen quickly and easily without having to use the cursor- movement keys. You simply move the pointer to the on-screen position you want, press the mouse button, and the cursor appears at the pre-selected position. Question: What are some other advantages of using a mouse? A mouse also allows you to create graphics such as lines, curves, and freehand shapes on the screen. The mouse and mouse-based operating systems let you choose commands from easy-to-use menus and dialog boxes so you don’t have to type. Copyright © Texas Education Agency, 2013

11. THE MOUSE The mouse is controlled by using the following techniques: Left clicking Right clicking Double right click Pointing Dragging Copyright © Texas Education Agency, 2013

12. HOW THE MOUSE WORKS The mechanism for detecting motion is a combination of optics and electronics. The mouse contains motion-detecting rollers that are connected to small disks. As the disks spin, the slots in the disks break a light beam going from an LED to a photo-detector. The rate that the light beam is broken tells the computer how fast the mouse is going and in what direction. Copyright © Texas Education Agency, 2013

13. MAINTENANCE The mouse should be cleaned often to remove the lint and grime that collects on the rollers and on the ball. Turn the computer off and disconnect the mouse from the computer. Turn the mouse upside down and twist the restraining cover and remove the ball. Wash the ball in warm soap water, rinse, and dry it completely with a lint-free cloth. Shake any loose material out of the mouse case, and examine the three axles. Copyright © Texas Education Agency, 2013

14. MAINTENANCE (CONT.) Remove any lint from the axles using a can of compressed air. You may need to scrape the lint loose the with a cotton-tipped swab or with your fingernail. Shake out the debris you scrap off. Replace and secure the mouse and place the cover back Clean the outside of the case if necessary. Always keep the mouse pad clean. Wipe it with a damp cloth. Copyright © Texas Education Agency, 2013

15. OTHER INPUT DEVICES As handy as it is, some people do not like using a mouse or have difficulty maneuvering one. For these reasons and others, hardware makers have developed various input devices that duplicate the mouse's functionality but interact with the user in different ways. The primary goals of these "mouse variants" are to provide ease of use while taking up less space than a mouse. They all remain stationary and can even be built into the keyboard. Copyright © Texas Education Agency, 2013

16. OTHER INPUT DEVICES Some other input devices include variants of the mouse, such as a scanner, a web cam, and an integrated pointing device such as a joystick. Digital cameras, video cameras, and scanners are used for inputting graphics and text into the computer. Pens, touch screens, and microphones are also common alternatives used for inputting. Copyright © Texas Education Agency, 2013

17. OTHER INPUT DEVICES Question: What are some examples of other input devices? Copyright © Texas Education Agency, 2013