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ICT(Information Technology)Presented to:
Sir IMDAD ULLAHPresented by:
Zeeshan HaiderRashda NawazZainib AliSana KiranAwais AkramMaria javed
Department of IT Institute of computing
Bzu Multan
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TOPIC:
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A Computer ....
takes input processes it according to stored
instructions produces results as output If necessary store the data for future use
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Components of Computer Systems Keyboard Display System Unit Storage Printer
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Input Systems
INPUT Keyboard » Most common input device » QWERTY
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Input Systems INPUT Mouse » Cursor manipulation Device » Trackball
Trackball
Mouse
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Input System
Touch Screens(common device)
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Input Systems INPUT Bar Code Readers
Barcodes
Barcode Reader
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Input Systems Camera Systems(common device) Video conferencing
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Output Systems
» LCD (Liquid Crystal Display)
» CRT (Cathode RayTube)
» Music
Music System
LCD
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Output Systems
• Modems
– Modulator-Demodulator
– Allows computers to
communicate over telephone lines
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Output Systems
Hard Copy Printer
A printer is an output device that’s prints charters symbols & graphics on papers the printer o/p is called hard copy.
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Storage Systems
RAM - Random Access Memory
Read/Write Memory
Volatile ROM - Read Only Memory
Non-volatile
Won’t disappear when power is off
RAM
ROM
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Storage Systems
Optical Disks Digital code read by laser 650 Mbytes in a 4.75” plastic platter CD ROM; Erasable Disks
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Storage Systems
Magnetic Disk A circular platter coated with magnetic
material Floppy Disk Hard Disk
Floppy
Hardisk
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System Unit
System unit is a box that ‘s contains different components of computer system.
Most storage devices memory processor card ,posts& connectors reside inside the system unit.
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Components of System unit Mother Board CPU ALU CU
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Mother Board
It is most important circuit board in system unit
It contains different chips
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CPU
Two parts of CPU ALU (Arethimetic Logic Unit) CU (control unit)
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ALU
Arithmetic Unit
Arithmetic Unit of ALU performs basic arithmetic function such as subtraction, multiplication, addition, division
Control Unit
it acts like a supervisor of the computer .It does not execute instruction by itself .It controls and coordinates all activities of computer system
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Thanks…!
