Copyright © Texas Education Agency, 2013. All rights reserved.1 Keyboards, Mice, and Other Input Devices Principles of Information Technology.

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Presentation transcript:

Copyright © Texas Education Agency, All rights reserved.1 Keyboards, Mice, and Other Input Devices Principles of Information Technology

Keyboards 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 2Copyright © Texas Education Agency, All rights reserved.

Keyboards The standard keyboard layout consists of five different groups of keys: Alphanumeric keys Numeric keypad Function keys Cursor movement keys Modifier keys 3Copyright © Texas Education Agency, All rights reserved.

4 Keyboards Figure 1. Peter Norton’s Introduction to Computers 4 th Edition Copyright © Texas Education Agency, All rights reserved.

Keyboards Long periods of time on the keyboard can cause injuries An ergonomically designed keyboard can help prevent some of these injuries Good keyboard practices can also help prevent injuries 5Copyright © Texas Education Agency, All rights reserved.

Keyboards 6 The function of the keyboard Figure 2. Peter Norton’s Introduction to Computers 4 th Edition Copyright © Texas Education Agency, All rights reserved.

Keyboards Preventive Maintenance 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 7Copyright © Texas Education Agency, All rights reserved.

Keyboards Preventive Maintenance Continued A can of compressed air can also help remove the dust Clean the keyboard with a mild glass cleaner or isopropyl alcohol using a cloth and cotton swabs 8Copyright © Texas Education Agency, All rights reserved.

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 9Copyright © Texas Education Agency, All rights reserved.

The Mouse 10 The mouse is controlled by using the following techniques: Left clicking Right clicking Double right click Pointing Dragging Copyright © Texas Education Agency, All rights reserved.

The Mouse 11 The mechanism for detecting motion is a combination of optics and electronics. The mouse contains motion-detecting rollers that are connected to small disks. Copyright © Texas Education Agency, All rights reserved.

The Mouse 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, All rights reserved.12

The Mouse: Preventative Maintenance 13 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. Copyright © Texas Education Agency, All rights reserved.

The Mouse: Preventative Maintenance 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. Copyright © Texas Education Agency, All rights reserved. 14

The Mouse: Preventative Maintenance 15 Shake any loose material out of the mouse case, and examine the three axles. 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. Copyright © Texas Education Agency, All rights reserved.

The Mouse: Preventative Maintenance 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. 16Copyright © Texas Education Agency, All rights reserved.

Other Input Devices 17 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, All rights reserved.