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Copyright  © 2006 by The McGraw-Hill Companies, Inc. llri hts reser!e".

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Copyright  © 2006 by The McGraw-Hill Companies, Inc. llri hts reser!e".

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Chapter 3A

Using the Keyboard AndMouse

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3A-3

The Keyboard

• The most common input device – Must be proficient with eyboard

 – !i"" is ca""ed eyboarding

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3A-#

The Keyboard

• $ow eyboard wors – Keyboard contro""er detects a ey press

 – Contro""er sends a code to the C%U

• Code represents the ey pressed – Contro""er notifies the operating system

 – &perating system responds

 – Contro""er repeats the "etter if he"d

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3A-'

The Mouse

•  A"" modern computers have a variant•  A""ows users to se"ect ob(ects

 – %ointer moved by the mouse

• Mechanica" mouse – )ubber ba"" determines direction and speed

 – The ba"" often re*uires c"eaning

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3A-+

The Mouse

• &ptica" mouse – ,ight shown onto mouse pad

 – )ef"ection determines speed and direction

 – )e*uires "itt"e maintenance

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The Mouse

• .nteracting with a mouse – Actions invo"ve pointing to an ob(ect

 – C"icing se"ects the ob(ect

 – C"icing and ho"ding drags the ob(ect – )e"easing an ob(ect is a drop

 – )ight c"icing activates the shortcut menu

 – Modern mice inc"ude a scro"" whee"

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The Mouse

• 0enefits – %ointer positioning is fast

 – Menu interaction is easy

 – Users can draw e"ectronica""y

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The Mouse

• Mouse button configuration – Configured for a right-handed user 

• Can be reconfigured

 – 0etween 2 and + buttons – 4tra buttons are configurab"e

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6ariants of the Mouse

• Tracba""s – Upside down mouse

 – $and rests on the ba""

 – User moves the ba"" – Uses "itt"e des space

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6ariants of the Mouse

•  Trac pads – !tationary pointing

device

 – !ma"" p"astic

rectang"e – 7inger moves across

the pad

 – %ointer moves with

the pointer  – %opu"ar on "aptops

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6ariants of the Mouse

• Trac point – ,itt"e (oystic on the eyboard

 – Move pointer by moving the (oystic

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rgonomics and .nput 9evices

• rgonomics – !tudy of human and too" interaction

 – Concerned with physica" interaction

 – Attempts to improve safety and comfort

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rgonomics and .nput 9evices

• )epetitive !train .n(ury :)!.; – Caused by continuous misuse of the body

 – Many professions suffer from )!.

• Carpa" Tunne" !yndrome – Carpa" tunne" is a passage in the wrist

 – $o"ds nerves and tendons

 – %ro"onged eyboarding swe""s tendons

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Carpa" Tunne" !yndrome

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rgonomics and .nput 9evices

• &ffice hardware suggestions – &ffice chairs shou"d have

•  Ad(ustab"e armrests and height

• Armrests• ,ower bac support

 – 9ess shou"d have

• $ave a eyboard tray

• Keep hands at eyboard height

• %"ace the monitor at eye "eve"

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rgonomics and .nput 9evices

• Techni*ues to avoid )!. – !it up straight

 – $ave a padded wrist support

 – Keep your arms straight – Keyboard proper"y

 – Tae fre*uent breas

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Copyright  © 2006 by The McGraw-Hill Companies, Inc. llMcGraw-Hill Technology

Chapter 3A

nd of Chapter