This document provides an overview of operating systems including definitions, types, history, examples, components, real-time operating systems, operating system development as a hobby, diversity and portability, market share, and network operating systems. It was presented by Group 6 from the Computer Science and Engineering department of DIU university to lecturer Nasrin Akter.

1. Operating system
Presented by
 Group 6
 ID:
 151-15-5021
 151-15-4945
 151-15-4869
 151-15-5102
 151-15-5103
 Dept: CSE
 DIU
Presnted to
 Nasrin Akter
 Lecturer
 Dept. of CSE
 DIU

2. Agenda
 Defination
 Types of operating
system
 History
 Examples of operating
system
 Components
 Real time operating
system
 As a hobby
 Diversity and portability
 Market share
 Network operating
system

3. What is operating system?
An operating system (OS) is software that manages
computer hardware and software resources and
provides common services for computer programs.

4. Types of operating system
1. Single and multi-tasking operating system
2. Single and multi-user operating system
3. Distributed operating system
4. Templated operating system
5. Embedded operating system
6. Real time operating system

5. History of operating system
There are two types of system in the
History of operating system.
 Mainframe computer:
 IBM OS/360, 1966
 IBM CP-67, 1967
 Microcomputers:
The first microcomputer did not have the capacity or need
for the elaborate oper ating systems that had been
developed for mainframes and minis; minimalistic
operating systems were developed, often loaded from ROM
and known as monitors.

6. Example of operating system
• Unix and Unix-like operating system
• BSD and its descendants
• OS X
• Linux and GNU
• Google Chromium OS
Google Chromium OS

7. Components
The components of an operating system all exist in order to make the
different parts of a computer work together.
• Kernel
• Program execution
• Interrupts
• Modes
• Memory Management
• Virtual memory
• Multitasking
• Disk access and files systems
• Device drivers
• Networking
• Security
• User interface

8. Real time operating system
A real-time operating system (RTOS) is an
operating system intended for applications with
fixed deadlines real-time computing. Such
applications include some small embedded
systems automobile engine controllers,
industrial robots, spacecraft, industrial control,
and some large-scale computing systems.

9. As a hobby
Operating system development is one of the most
complicated activities in which a computing hobbyist may
engage.
In some cases, hobby development is in support of a
“homebrew” computing device, for example, a simple
single-board computer powered by a 6502
microprocessor

10. Diversity and Portability
Application software is generally written for use on a
specific operating system, and sometimes even for
specific hardware.
This cost in supporting operating systems diversity can be
avoided by instead writing applications against software
platforms like Java or Qt.

11. Market share
Operating system 2012(Million of
Units)
2013(Million of
Units)
Android 504 878
Window 346 328
iOS /Mac OS 214 267
Blackberry 35 24
Others 1,117 803
Total 2,216 2,300
2013 Worldwide Device Shipments by Operating System

12. Network operating system
Network operating system refers, to software that
implements an operating system of some kind that is
oriented to computer networking.
Advantages
 Ease of setup
 Less hardware needed, no server needs to be purchased.
Disadvantages
 No central location for storage.
 Lack of security that a client/server type offers.