Chapter 3 – Computer Hardware Computer Components – Hardware (cont.) Lecture 3.
The Computer System (Hardware) Part 1
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Transcript of The Computer System (Hardware) Part 1
System a group of interrelated components working together toward a common goal by accepting inputs and providing outputs in an organized transformation process
http://www.nytimes.com/2008/01/13/business/13digi.html?ex=1200978000&en=0b6cc3ab4da6a22b&ei=5070&emc=eta1
System Examples:
Digestive System
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Computer System consists of computers and computer-controlled devices that process data by executing programs.
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Computer SystemDevices:
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Computer SystemComponents:
HardwaresSoftwares
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Hardware the physical component of computer system
4 Types:Input DevicesOutput DevicesStorage DevicesProcessing and Control Devices
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Input Devices used to enter data into a computer and to give commands to manipulate the data
physical equipment which read or translate data into electronic impulses, which can be understood by the computer
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Input Devices1. Keyboard2. Mouse3. Trackball4. Touchpad5. Light Pen6. Joystick7. Touchscreen
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Input Devices8. Voice Input9. Barcode Readers10. Pen Based System11. Scanners12. Optical Mark Recognition13. Optical Character Recognition
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Input Devices14. Smart Cards15. Optical Cards 16. Video Input Device17. Electronic Camera18. Sensors19. Magnetic Ink Character Recognition
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Keyboard the standard input device
2 Major Types:Qwerty KeyboardDvorak Keyboard
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KeyboardQwerty Keyboard
- invented by Christopher Sholes in 1868
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KeyboardDvorak Keyboard
- invented by Augustus Dvorak in 1936
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Keyboard3 Partitions:
Functional KeysAlphanumeric KeysNumeric Key Pad
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Mouse Device that is rolled about on a desktop to direct a pointer on the computer’s display screen
Mouse Pointer
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Mouse2 Major Types:
MechanicalOptical
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Mouse5 Mouse Actions:
ClickDouble ClickDrag and DropRight ClickPoint
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Trackball a movable ball, on top of stationary device, that is rotated with the fingers or palm of the hand
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Touch Pad a graphics tablet which consists of a flat drawing surface and a pointing tool that functions like a pencil
The tablet turns the pointer’s movements into digitized data that can be read by special computer programs
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Touch Pad
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Light Pen looks like an oversized writing pen
attached to an electronic cord and requires special software support.
Works by sensing the sudden small change in brightness of a point on the screen when the electron gun refreshes that spot.
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Light Pen
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Joystick is a pointing tool that consists of a
vertical handle like a gearshift lever mounted on a base with one or two buttons
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Touch Screens a video display screen that has been
synthesized to receive input from the touch of a finger
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Voice/Audio Input convert a person’s voice into digital
signals
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Barcode Readers are photoelectric scanners that read
the vertical stripes that comprise the bar-code
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Pen Based System use a pen-like stylus to enter
handwriting and marks into a computer
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Scanner convert text, photographs, and
black-and-white or color graphics into computer-readable form
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Optical Mark Recognition uses a device that reads pencil
marks and converts them into computer-usable form
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Optical Character Recognition
uses a device that reads special preprinted characters and converts them into machine-readable form
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Smart Cards
looks like a credit card but contains a microprocessor and memory chip
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Optical Cards
are plastic, laser recordable, credit card size cards used with an optical card reader
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Video Input
the signals that come from a VCR or a camcorder must be converted to digital form through special video card installed in the computer
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Electronic Camera
captures images in electronic form for immediate viewing
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Sensors
collects specific kinds of data directly from the environment and transmits it to a computer
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MICR
computer systems of the banking industry can magnetically read checks and deposit slips using magnetic ink character recognition (MICR) technology
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MICR
Another familiar form of magnetic data entry is the magnetic stripe technology that helps computers read credit cards
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MICR
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MICR
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Output Devices convert the information that comes out of a computer (bits and bytes) into screen images, print or other forms
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Output Devices1. Monitor2. Printer3. Projector4. Speakers
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Monitor primary output device
vary greatly in the sharpness and quality of the images they produce
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MonitorTypes:
Monochrome
Flat Panel Monitor
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MonitorTypes:EGA (Enhanced Graphics Adapter)
640 X 350 Pixel Screen.
VGA (Video Graphics Array) 640 X 480 Pixel Screens
SVGA (SUPER VIDEO GRAPHICS ARRAY) 1,024 X 768 Pixel Screen
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