INTRODUCTION TO INFORMATION TECHNOLOGY- IT Basics

INTRODUCTION TO INFORMATION TECHNOLOGY- IT Basics

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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Affiliated to Institution of G.G.S.IP.U, Delhi IT Basics Keywords : Memory, CPU B.COM INTRODUCTION TO INFORMATION TECHNOLOGY BCOM 107
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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Computer Hardware Software Application Software System Software CPU Memory I/O Etc.
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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Fig: Computer
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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 MOTHERBOARD
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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 CPU
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  RAM Memory chips
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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Affiliated to Institution of G.G.S.IP.U, Delhi RAM & ROM
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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 SRAM
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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 DRAM
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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Ports CPU RAM Disk controller Graphics card Sound card Network card Printer Mouse Keyboard Modem Monitor Speakers bus Computer Fig: Schematic Diagram of a Personal Computer...
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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Secondary Storage • Stores information • Non-volatile, permanent storage • Characteristics – Media – Capacity – Access time
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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Secondary Storage Devices  Two major types of secondary storage device 1. Serial Devices – Magnetic tapes (very fast sequential access) 2.Direct Access Storage Devices (DASDs) – Magnetic Discs Hard disks (high capacity, low cost, fast) Floppy disks (low capacity, lower cost, slow) – Optical Disks CD-ROM = (Compact disc, read-only memory
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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Limitation of Secondary Devices
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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Magnetic Tape • Sequential access • Commonly used for backing-up data • Very large capacity • Types of magnetic tape – Tape cartridges – Magnetic tape reels
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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Magnetic Tape
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  TRINITY INSTITUTE OFPROFESSIONAL STUDIES Sector – 9, Dwarka Institutional Area, New Delhi-75 Magnetic Tape • Plastic ribbon 1/2 inch or ¼ inch wide • 50 to 2400 feet long • Coated with magnetic material such as iron oxide or chromium dioxide. • Data stored in form of tiny magnetized(1) or non magnetized spots(0) • Can be erased and reused in definitely • Information can be read many times without affecting data
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  Magnetic Tape • Whatis magnetic tape? • Thin layer of material capable of storing a magnetic signal • Usually contains Iron Oxide • Protected by backing layer called the “Substrate”
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  Examples of MagneticMedia • Some you are probably familiar with: • Cassette tapes • VHS video tape • Computer Tape • 8-track • DAT
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  Magnetic Tape Types •Tape cartridges – Backup tape for microcomputer – Capacities range from 120 MB to 5 GB – Digital audio tape (DAT) • Tape reels – Minicomputer and mainframe – 1/2 inch wide and 1/2 mile long – Stores 1600 to 6400 cpi