1. Different Types of
Operating Systems
Leili Barekatain, Mina Beiki,
Zahra Rahimi

2. Multitasking Operating
Systems
A multitasking operating system
(OS) is one that can work on more
than one task at a time by
switching between the tasks very
rapidly

3. Types Of Multitasking:
True
Multitasking
Preemptive
Multitasking
Cooperative
Multitasking

4. Advantages of Multitasking
Operating System:
Secured
Memory
Great Virtual
Memory
Manage
Several
Users
Time Shareable
Good Reliability
Use
Multiple
Programs
BackGround
Processing Optimize Computer Resources
Disadvantages of
Multitasking Operating
System:
Memory
Boundation

5. Examples Of
Multitasking OS
Windows 7
03
Windows Vista
02
Windows 2000
06
Windows 10
05
Windows 8
04
Unix
09
Linux
08
IBM’s OS/390
07
Windows XP
01

6. Network Operating System
NOS is an operating system that manages network resources

7. Types Of Network OS
● Peer-to-peer
To share network resources saved in a common,
accessible network location
● Client/server
provide users with access to resources through
a server

8. What is NOS features?
● Basic support for operating systems like protocol and processor support,
hardware detection and multiprocessing
● Printer and application sharing
● Common file system and database sharing
● Network security capabilities such as user authentication and access control
● Directory
● Backup and web services
● Internetworking

9. Examples Of Network
OS
Artisoft’s
LANtastic
Banyan’s
VINES
Microsoft’s
LAN
Manager
Novell’s
NetWare

10. Real-Time Operating System
A real-time operating
system (RTOS) is a
special-purpose
operating system used
in computers that has
strict time constraints
for any job to be
performed.

11. Real-Time Operating System

12. Hard Real-Time
Operating System
In Hard RTOS, all critical tasks
must be completed within the
specified time duration

13. Soft Real-Time
Operating System
This operating system provides
some relaxation in the time
limit.

14. Firm Real-Time
Operating System
In this operating system
lacking a closing date might
not have a massive effect,
however may want to
purposely undesired effects.

15. Advantages Disadvantages
1. Maximum consumption
2. Task Shifting
3. Focus On Application
4. Real-Time Operating System In
Embedded System
5. Error Free
6. Memory Allocation
1. Limited Tasks
2. Use Heavy System Resources
3. Complex Algorithms
4. Device Driver And Interrupt signals
5. Thread Priority
6. Minimum Switching

16. Mobile Operating System
● A mobile operating system is an operating system that helps to run
other application software on mobile devices.
● It combines the beauty of computer and hand use devices.
● If you buy a mobile, the manufacturer company chooses the OS for
that specific device.

17. Popular platforms of the Mobile OS

18. Popular platforms of the Mobile OS

19. Batch Operating Systems
An operating system where the users who are using it do not interact
with the computer directly.

20. What is batch operating system?
● Used back in 1970!
● Mainframe computers
● Devices for input and output
● Same requirements job -> same group
● Examples of Batch based Operating System: Payroll System, Bank
Statements, etc.

21. What is batch operating system? cont.
The batch operating system grouped jobs that perform similar functions.
These job groups are treated as a batch and executed simultaneously.

22. Batch process activities:
4
Run
3
Stored in memory
2
FCFS
1
Job

23. Why are batch operating systems used?
● Less stress on the cpu, minimal user interaction
● Run huge repetitive jobs
● Modern batch operating systems → interactive
So what are the advantages and disadvantages? Will be discussed in the next slide.

24. Advantages Disadvantages
1 This system can easily manage
large jobs again and again.
When a job fails once, it must be scheduled
to be completed, and it may take a long time
to complete the task.
2 The batch process can be divided
into several stages to increase
processing speed.
Computer operators must have full
knowledge of batch systems.
3 When a process is finished, the
next job from the job spool is run
without any user interaction.
The batch system is quite difficult to debug.
4 CPU utilization gets improved. The computer system and the user have no
direct interaction.

25. Distributed
Operating Systems
Distributed systems use many
central processors to serve multiple
real-time applications and users.

26. How does it work?
● connects multiple computers via a single
communication channel
● communicate via high-speed buses or
telephone lines
● supports many real-time products and
different users

27. Architecture of a distributed operating system
● All software and hardware compounds are
located remotely.
● Resource sharing
● Each computer node has its own memory

28. Features of distributed operating system
Openness A well-defined and detailed interface of the components must be
published.
The new component, which is to be added, must be easily integrated with
existing components
Flexibility A DOS's flexibility is enhanced by modular qualities and delivers a more
advanced range of high-level services.
Resource
Sharing
Allows users to share resources. They can also share resources in a
secure and controlled manner.

29. Features of distributed operating system
Transparency The primary purpose of a distributed operating system is to hide the fact
that resources are shared.
Heterogeneity The components of distributed systems may differ and vary in operating
systems, networks, programming languages, computer hardware, and
implementations by different developers.
Fault
Tolerance
Fault tolerance is that process in which user may continue their work if the
software or hardware fails.

30. Applications of Distributed Operating System
Network
Applications
Telecommunication
Networks
Parallel
Computation
Real-Time Process
Control
Solaris

31. Advantages Disadvantages
1 Increasing data availability Scheduler limitations
2 Reduces the probability of data
corruption
Complex underlying software
3 Operates independently Communication latency
4 It helps in the reduction of data
processing time.
Expensive