I_O_Storage_Dev

I_O_Storage_Dev - INPUT DEVICES What are INPUT DEVICES ?...

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INPUT DEVICES
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What are INPUT DEVICES ? Input devices enable you to input Information and commands in the computer.
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Following are the most commonly Following are the most commonly used Input Devices :- used Input Devices :- KEYBOARD MOUSE TRACKBALL DIGITIZER LIGHT PENS TOUCH SCREENS SCANNERS JOYSTICKS PEN DRIVE
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Keyboard Keyboard One of the first peripherals to be used with computers. A standard keyboard has about 100 keys
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The standard keyboard layout The standard keyboard layout Types of Keys Alphanumeric Keys (QWERTY, DVORAK) Numeric keypad modifier keys (shift, ctrl., alt.) Function keys (F1, F2. .) The cursor-movement keys (arrow keys, pg up/ pg dn.) special purpose keys (Delete, Esc., start, etc.)
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Designed to reduce stress & fatigue.
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How the keyboard feeds input How the keyboard feeds input Keyboard controller- A tiny chip, notes that a key has been pressed Keyboard Buffer- a temporary storage area, where scan code is placed. Computer’s systems software – receives the interrupt request Systems software reads the scan code and passes it to the CPU
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Mouse is a pointing device that helps control the position of the graphical pointer 5 techniques involved in using mouse are pointing, clicking,double-clicking, dragging, right-clicking
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Types Of Mice Types Of Mice Mechanical: Has a rubber or metal ball on its underside that can roll in all directions. Mechanical sensors within the mouse detect the direction the ball is rolling and move the screen pointer accordingly Optomechanical: Same as a mechanical mouse, but uses optical sensors to detect motion of the ball. Optical: Uses a laser to detect the mouse's movement. Optical mice have no mechanical moving parts. They respond more quickly and precisely Cordless mice aren't physically connected at all. Instead they rely on infrared or radio waves to communicate with the computer
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Data Interface Data Interface USB Connector Printers connected to parallel printer ports, A typical PS/2 connector Modems used the serial port, Devices that needed faster connections came with their own cards, which had to fit in a card slot inside the computer's case . The goal of USB is to end all of these headaches. The Universal Serial Bus gives you a single, standardized, easy-to-use way to connect up to 127 devices to a computer.
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Trackball is a mouse turned upside-down The ball is rolled to move the pointer around the screen, hence there is no need to move the whole device
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TRACKPAD There is a small touch surface & movement of finger on it is translated into pointer movement on the screen. Trackpads have 2 to 3 buttons that function the same
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This note was uploaded on 11/26/2011 for the course IT 98 taught by Professor Kagal during the Spring '09 term at IESE Business School.

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I_O_Storage_Dev - INPUT DEVICES What are INPUT DEVICES ?...

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