NSSCompDevices.docx - Northland Security Systems 3200 North 22nd Street Springfield IL 62102 Computer Input Devices Engineers have been especially

NSSCompDevices.docx - Northland Security Systems 3200 North...

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Northland Security Systems 3200 North 22 nd Street Springfield IL 62102 Computer Input Devices Engineers have been especially creative in designing new ways to get information into computers. Some input methods are highly specialized and unusual, while common devices often undergo redesign to improve their capabilities or their ergonomics, the ways in which they affect people physically. Some common input devices include keyboards, mice, trackballs, and touchpads. Keyboard A keyboard can be an external device that is attached by means of a cable, or it can be attached to the CPU case itself as it is for laptop computers. Most keyboards today are QWERTY keyboards, which take their name from the first six keys at the left of the first row of letters. An alternative, the DVORAK keyboard, places the most commonly used keys close to the user’s fingertips and speeds typing. Many keyboards have a separate numeric keypad, like that of a calculator, containing numbers and mathematical operators. All keyboards have modifier keys that enable the user to change the symbol or character that is entered when a given key is pressed. The Shift key, for example, makes a letter uppercase. Keyboards also have special cursor keys that enable the user to change the position on the screen of the cursor, a symbol that appears on the monitor to show where in a document the next change will appear. Most keyboards also have function keys, labeled F1, F2, F3, and so on. These keys allow the user to issue commands by pressing a single key.
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  • Spring '14
  • JoyA.Dougherty

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