The document discusses operating systems, providing definitions and examples. It notes that an operating system manages computer hardware and software resources, provides common services for programs, and is required for applications to function. Popular modern operating systems include Android, BSD, iOS, Linux, OS X, QNX, Microsoft Windows, Windows Phone, and IBM z/OS. The document then gives a brief history of several operating systems, including GM-NAA I/O, Unix, MS-DOS, Mac OS, Windows 2000, Windows XP, Windows Server 2003, IOS, Android, Windows 7, and Windows 8. It concludes by describing some key components and features of operating systems, such as the kernel, program execution, modes, device drivers

1. OPERATING SYSTEM
6/15/2016

2. PRESENTED BY
S.VIVEKANANDAN
R.THANGARAJ
S.SHAILESH
S.SAGAR

3. WHAT IS OPERATING SYSYEM ?

4. INTRODUCTION
An operating system (OS) is software that manages
computer hardware and software resources and
provides common services for computer programs.
The operating system is an essential component of
the system software in a computer system.
Application programs usually require an operating
system to function.
OS/360 was used on most IBM mainframe
computers beginning in 1966, including computers
utilized by the Apollo program.

5. Examples of popular modern
operating systems include Android,
BSD, iOS, Linux, OS X, QNX, Microsoft
Windows,Windows Phone, and IBM
z/OS. All these examples, except
Windows, Windows Phone and z/OS,
share roots in UNIX.

6. HISTORY OF OS
1956, GM-NAA I/O:Developed by Robert L.
Patrick of General Motors for use on their IBM
704 mainframe.
1969, Unix :Developed by AT&T Bell Labs
programmers Ken Thompson.
1981, MS-DOS: Developed by Microsoft for the
IBM PC’s .
1984, Mac OS :: Developed by Apple Computer,
Inc .
Windows 2000: Developed by Microsoft
Windows 2000 was a much Improved .
2001 Windows XP : Developed by Microsoft,
Windows XP was an enhanced version of
Windows 2000 code base .

7. 2003: Windows Server 2003 (sometimes referred to
as Win2K3) is a server operating system produced
by Microsoft, released on April 24, 2003
2007 IOS : On June 29, 2007, Apple released the
first version of ios release,IOS is a mobile
operating system developed by Apple Inc.
2007 Android : Android is a mobile operating
system (OS) based on the Linux kernel.
2009: Windows 7 IS A os of microsoft release in
2009
2012: Windows 8 is latest os of microsoft, for
pc,mobile phone example : nokia lumia 730 etc.

8.  GUI :Operating System contains graphics and icons and
is commonly navigated by using a computer mouse
Examples of GUI Operating Systems are:
System 7.x
Windows 98
Windows CE
Real-time
 A real-time operating system - a multitasking
operating system that aims at executing real-time
applications.

9.  Multi-user - A multi-user operating system allows for
multiple users to use the same computer at the same
time and different times.
Linux
Unix
 Multitasking - An operating system that is capable of
allowing multiple software processes to run at the same
time.
Linux
Unix
Windows 7
 Multiprocessing - An operating system capable of
supporting and utilizing more than one computer
processor
Linux
Unix
Windows XP

10. COMPONENTS OF OPERATIN
SYSTEM
 Kernel : With the aid of the firmware and device drivers,
the kernel provides the most basic level of control over all of
the computer's hardware devices.
 Program execution : The operating system provides an
interface between an application program and the
computer hardware, so that an application program can
interact with the hardware
 Modes : Modern CPUs support multiple modes of
operation. CPUs with this capability use at least two modes:
protected mode and supervisor mode.

11.  Device drivers : A device driver is a specific type of
computer software developed to allow interaction with
hardware devices.
 Multitasking : Multitasking refers to the running of
multiple independent computer programs on the same
computer; giving the appearance that it is performing the
tasks at the same time.
 User interface : Every computer that is to be operated by
an individual requires a user interface. The user interface
is usually referred to as a shell and is essential if human
interaction is to be supported.