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1
OPERATING SYSTEMS
Basics of Operating Systems
HOME PREVIOUS TOPIC NEXTPREVIOUS QUESTION PAPERS FOR OS
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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