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OPERATING SYSTEMS

Basics of Operating Systems

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CPP TUTORIALS

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Recap

In the last class, you have learnt about

• Generations of Computers

– First, Second, Third, Fourth

• Different Technologies

– Vacuum Tubes, Transistors, Large scale IC’s, Very large

scale IC’s

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Objectives

On completion of this period, you would be able to know

• Types of Computers

• Brief History

• OS’s for Mainframe and Mini computers

• Operating Systems for Micro computers

• Advanced Operating Systems

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Types of Computers

• Super Computers

• Main frame computers

• Mini computers

• Micro computers

Super Computers

Main Frame Computers

Mini Computers

Micro Computers

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History

• In 1940, the earliest Digital Computer had no

Operating System

• In 1950, General Motor Research Laboratories

implemented the operating system called

“Single Stream Batch Processing Systems” for

IBM 701 computer

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In 1960 Operating Systems

Operating System Computer

CP-67/CMS

OS-MVT

OS-MFT

DOS/360

System 360/67

Bigger 360 systems

Medium 360 systems

Small 360 systems

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Time Sharing Operating Systems in 1970’s

Operating System Computer System

TOPS-10 DEC-10

RSTS/E,RSX-11M PDP-11VMS VAX-11

AOS 16 bit Mini computer

AOS/VOS 32 bit Mini computer

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More Operating Systems

• CTSS for IBM 7094 computers

• IBSYS and FORTRAN Monitor System (FMS) for

7094 computers

• MULTICS - to support simultaneous time sharing users

• UNIX for PDP-11/45 mini computers

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OS for Micro Computers In 1980

• Control Program for Micro computer (CP/M) for

Intel 8080 in 1974

– CP/M went through a number of versions

• MP/M - a 16 bit multi-user, time sharing OS

• CP/NET- to provide networking capabilities

• PC-DOS for IBM-PC on Intel 8086

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• QDOS developed by “Seattle Computers” for Intel

8086

• MS-DOS by Microsoft for PC’s

• XENIX- Multi-user OS for PC’s

• OS/2 – Multi-user OS for PC’s

OS for Micro Computers

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Operating System’s with GUI Capabilities

• MS WINDOWS

• MS WINDOWS 9X

• MS WINDOWS-NT

• MS WINDOWS-XP etc..

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Advanced Operating Systems

• Distributed Operating Systems

• Network Operating Systems

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Summary

• Types of Computers

– Super, Mainframe, Mini, and Micro Computers

• Batch Processing OS’s are used for Mainframes

Ex: - Single Stream Batch Processing System, CP-67, MVS etc.,

• Time Sharing Operating Systems are used for mini computers

Ex: - MULTICS, UNIX, OS/2 Etc.,

• Operating System for micro computers

Ex: - MS-DOS, XENIX, WINDOWS, UNIX etc.,

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Frequently Asked Questions

1. Write about the history of Operating System

2. List the Operating Systems which supports GUI capabilities

3. List the Operating Systems used in microcomputers

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Quiz

1. What is the popular operating system used in PC’s

a. UNIX

b. MULTICS

c. MS-DOS

d. WINDOWS-NT

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Quiz

2. Which is the most popular multi-user Operating System

a. WINDOWS

b. UNIX

c. MS-DOS

d. CP/M

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Quiz

3. Which is the Operating System with GUI feature?a. WINDOWS

b. UNIX

c. MS-DOS

d. CP/M

Other subject materials

• Web designing

• Micro processors

• C++ tutorials

• java

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