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Introduction to computer system (Computer hardware: (3-Output Devices…
Introduction to computer system
computer system
Definition of computer and system
Types of computers:
By Speed
PC (Personal Computer) Workstation Mini Computer Main Frame Supercomputer Laptop and Smartphone Computers
By Task
General tasks
Special tasks
Computer ‘s Generations:
First Generation : 1946-1959. Vacuum tube based.
Third Generation : 1965-1971. Integrated Circuit based.
Second Generation :1959-1965. Transistor based.
Basic logical structure of the computer:
Main Steps:
1-Taking Input
2-Storing Data
3-Processing Data
4-Producing output
5- Controlling the workflow
computer software
1.System software.
2.Application software.
3.Storage measurements
4.Speed measurements 5.Computer viruses. 6.The binary number system.
Computer hardware:
1-Input Devices:
Keyboard
Pen scanner
Sound
Microphone
pictures “ images”
Webcam
Scanner
Text
2- Central Processing Unit (CPU):
1- Memory or Storage Unit
2- Control Unit
3- ALU(Arithmetic Logic Unit)
3-Output Devices
Text, sound, image
Monitors
Printer
Speaker
Multimedia projector
Fourth Generation : 1971-1980. VLSI microprocessor based.
Fifth Generation : 1980-onwards. ULSI microprocessor based.