Operating systems Basics

1. Computer Operating Systems
180 Daraga ….. New Stage 6
Lecturer: Sherif Mousa
Email: eng.sherif.mosa@gmail.com

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Feel Free To Ask @ Anytime

3. Computer Operating Systems
Agenda
• Definition
• Why?
• Components
• History
• Evolution
• Types
• Then What ?
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4. Definition
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5. Computer Operating Systems
Definition
• Operating System (OS)
– A collection of software that manages computer
hardware resources and provides
common services for computer programs.
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• Operating System (OS)
– A collection of software that manages computer
hardware resources and provides
common services for computer programs.

6. Why?
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7. Computer Operating Systems
Why?
• With NO OS
– Every program needs the full hardware
specification and drivers to run correctly.
• OS main responsibilities
– Manages computer resources.
– Intermediate between user applications and
hardware.
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8. Computer Operating Systems
OS Responsibilities
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User
Applications
Hardware
CPU
RAM
Display
Keyboard
Operating System

9. Components
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10. Computer Operating Systems
Components
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User
Applications
Hardware
CPU
RAM
Display
Keyboard
Operating System
Operating System
Boot Loader
Kernel
Device Drivers
Networking
Security
User Interface
User Applications

11. History
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12. Computer Operating Systems
History
• 1950s & 1960s
– LEO, IBM,
MIT, Bell Labs
• 1969
– UNIX (AT & T)
– Ken Thompson, Dennis Ritchie
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13. Computer Operating Systems
History (cont’d)
• 1980s
– Mac OS 1984 (Apple)
– Windows 1985 (Microsoft)
• 1991 (Multi-Threaded)
– GNU/Linux (FSF)
• 2007
– Android (Google)
• 2007
– iOS (Apple)
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14. Evolution
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15. Computer Operating Systems
Evolution
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Unix Terminal
DOS Command Line
First Mouse Design 1960s
1973 Xerox Alto PC
MAC OS 1 , 1984Windows 1 , 1985

16. Computer Operating Systems
Evolution (Today)
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17. Computer Operating Systems
Evolution (Android)
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18. OS Types
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19. Computer Operating Systems
OS Types
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20. Computer Operating Systems
OS Types (PCs & Servers)
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21. Then What ?
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