Ch1 introducing computer systems

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  • 1.What is the computer ? 2. All the computers now around you are digital . What do we mean of digital? Digital means numbers so they work by numbers they break all the information in tiny units and use numbers to represent those information e.i 0100 0001 (A)
  • 1. Processor2. Memory3. Input and output4. Storage.
  • Ch1 introducing computer systems

    1. 1. Chapter 1 Introducing Computer SystemsMcGraw-Hill Technology Education Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
    2. 2. Outline • The Computer Defined • Parts of the Computer System • Information Processing Cycle • Computers For Individual Use • Computers For Organizations • Computers in society2
    3. 3. The Computer Defined • Electronic device • Converts data into information • The computers used numbers to represent those pieces of information so they called Digital Computers3
    4. 4. Parts of the Computer System • Computer systems have four parts 1. Hardware 2. Software 3. Data 4. User4
    5. 5. Parts of the Computer System 1. Hardware - Anything that can be touched 2. Software -Tell the computer what to do Also called a program5
    6. 6. Parts of the Computer System 3. Data - Pieces of information 4. Users - People operating the computer - Most important part - Tell the computer what to do6
    7. 7. Information Processing Cycle • Steps followed to process data •Input •Processing •Output •Storage7
    8. 8. Essential Computer Hardware • Hardware categorized into four types:8
    9. 9. Essential Computer Hardware 1. Processing devices – Brains of the computer – Most computers have several processors – Central Processing Unit (CPU) , or called ( processer)9
    10. 10. Essential Computer Hardware 2. Memory devices – Stores data or programs – Random Access Memory (RAM) • Volatile • Stores current data and programs – Read Only Memory (ROM) • Permanent storage of programs10
    11. 11. Essential Computer Hardware 3. Input and output devices – Input devices accept data • Keyboard, mouse – Output devices deliver data • Monitor, printer, speaker – Some devices are input and output • Touch screens • Digital camera11
    12. 12. Essential Computer Hardware Touch screens Digital camera12
    13. 13. Essential Computer Hardware 4. Storage devices – Hold data and programs permanently – Different from RAM – Floppy and hard drive – CD and DVD drives13
    14. 14. Computers For Individual Use • The following systems are examples of personal computer (PCs) 1.Desktop computers – The most common type of computer – Sits on the desk or floor – Performs a variety of tasks14
    15. 15. Computers For Individual Use 2. Workstations – Specialized computers – Optimized for science or graphics – More powerful than a desktop 3. Notebook computers – Small portable computers – Also called laptop computers – Typically as powerful as a desktop15 – Can include a docking station
    16. 16. Computers For Individual Use 4. Tablet computers – Newest development in portable computers – Input is through a pen – Run specialized versions of office products16
    17. 17. Computers For Individual Use 5. Handheld computers – Very small computers – Personal Digital Assistants (PDA) – Note taking or contact management – Data can synchronize with a desktop 6. Smart phones – Hybrid of cell phone and PDA – Web surfing, e-mail access17
    18. 18. Computers For Organizations • The largest organizational computers support thousands of individual user at the same time. 1. Network servers – Centralized computer – All other computers connect – Provides access to network resources – Often simply a powerful desktop18
    19. 19. Computers For Organizations •19
    20. 20. Computers For Organizations 2. Mainframes – Used in large organizations – Handle thousands of users – Users access through a terminal20
    21. 21. Computers For Organizations21
    22. 22. Computers For Organizations 3. Minicomputers – Called midrange computers – Power between mainframe and desktop – Handle hundreds of users – Used in smaller organizations – Users access through a terminal22
    23. 23. Computers For Organizations 4. Supercomputers – The most powerful computers made – Handle large and complex calculations – Process trillions of operations per second – Found in research organizations23
    24. 24. Computers in society• Home• Education• Small business• Industry• Government• Health care

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