INTRODUCTION TO INFORMATION TECHNOLOGY- IT Basics MOTHERBOARD CPU RAM & ROM SRAM DRAM Printer Keyboard Keyboard Modem Secondary Storage Devices

1. TRINITY INSTITUTE OF PROFESSIONAL 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

2. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, Dwarka Institutional Area, New Delhi-75
Computer
Hardware Software
Application
Software
System
Software
CPU Memory I/O Etc.

3. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, Dwarka Institutional Area, New Delhi-75
Fig: Computer

4. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, Dwarka Institutional Area, New Delhi-75
MOTHERBOARD

5. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, Dwarka Institutional Area, New Delhi-75
CPU

6. RAM
Memory chips

7. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, Dwarka Institutional Area, New Delhi-75
Affiliated to Institution of G.G.S.IP.U, Delhi
RAM & ROM

8. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, Dwarka Institutional Area, New Delhi-75
SRAM

9. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, Dwarka Institutional Area, New Delhi-75
DRAM

10. TRINITY INSTITUTE OF PROFESSIONAL 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...

11. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, Dwarka Institutional Area, New Delhi-75
Secondary Storage
• Stores information
• Non-volatile, permanent storage
• Characteristics
– Media
– Capacity
– Access time

12. TRINITY INSTITUTE OF PROFESSIONAL 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

13. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, Dwarka Institutional Area, New Delhi-75
Limitation of Secondary Devices

14. TRINITY INSTITUTE OF PROFESSIONAL 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

15. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, Dwarka Institutional Area, New Delhi-75
Magnetic Tape

16. TRINITY INSTITUTE OF PROFESSIONAL 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

17. Magnetic Tape
• What is magnetic tape?
• Thin layer of material capable of storing a magnetic
signal
• Usually contains Iron Oxide
• Protected by backing
layer called the
“Substrate”

18. Examples of Magnetic Media
• Some you are probably familiar with:
• Cassette tapes
• VHS video tape
• Computer Tape
• 8-track
• DAT

19. 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