The document discusses six main types of operating systems: single-user systems, which support either a single task or multi-tasking for one user; multi-user systems that allow multiple users to access a system simultaneously; multi-tasking systems that can run multiple programs concurrently by rapidly switching between them; multi-processing systems that use more than one CPU to enable several programs to run in parallel; embedded systems designed for devices like PDAs, cameras and cars with limited resources; and real-time systems intended for applications that require fast and predictable responses to inputs like industrial machinery.

1. TYPES OF OPERATING SYSTEM
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2. TYPES OF OS [1]
Distinguished by the response time and how data is
entered into the system
Single user
Multi user
Multitasking
Multi processing
Embedded
Real time
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3. [1] SINGLE USER [1]
TWO TYPES:
Single user, single task
Single user, multi tasking
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4. Single user, single task
Designed to manage the computer so
that one user can effectively do one thing
at a time.
Example: The Palm OS for Palm
handheld computers
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5. Single user, multi tasking
Designed with a single user in mind but can deal
with many applications running at the same time
 Type of operating system
most people use on
their desktop and laptop
computers today
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6. CONT…..
Examples: Microsoft's Windows and Apple's Mac
OS platforms
 For Example: It's entirely possible for a Windows
user to be writing a note in a word processor while
downloading a file from the Internet while printing
the text of an e-mail message.
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7. CONT….
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8. [2] MULTI USER [2]
Allows many different users to take advantage of
the computer's resources simultaneously
Allows multiple users to access the computer
system at the same time
Time Sharing system and Internet servers as the
multi user systems
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9. CONT…..
Examples: UNIX, VMS and Mainframe Operating
systems
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10. [3] MULTI TASKING [3]
Allows more than one program to run concurrently.
The tasks share common processing resources, such as
a CPU and main memory
In the process, only one CPU is involved, but it
switches from one program to another so quickly that it
gives the appearance of executing all the programs at
the same time.
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11. CONT…..
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screenshot of Debian Linux (version 7.1, "Wheezy") running the
GNOME desktop environment, Firefox, Tor, and VLC media
player, all at the same time.

12. [4] MULTI PROCESSING [3]
Multiprocessing, in general, refers to the
utilization of multiple CPUs in a single computer
system
Enables several programs to run concurrently
The term also refers to the ability of a system to
support more than one processor and/or the
ability to allocate tasks between them
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13. CONT…..
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MULTIPROCESSING OS

14. [5] EMBEDDED OS [4][5]
 Designed to be used in embedded computer systems
 Are able to operate with a limited number of resources
on small machines like PDAs
 Are very compact and extremely efficient by design
 is a computer that is part of a different kind of machine
 Examples include computers in cars, digital televisions,
ATMs, airplane controls, digital cameras, GPS navigation
systems, elevators, and among many other possibilities.
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15. CONT……
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Embedded OS in a car
Android OS in digital camera

16. [6] REAL TIME OPERATING SYSTEM [6]
is a multitasking operating system that aims at executing
real-time applications
The main objective of real-time operating systems is their
quick and predictable response to events
In it, the time interval required to process and respond to
inputs is so small that it controls the environment
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17. CONT….
Examples: QNX, RTLINUX
Are used to control machinery, scientific
instruments and industrial systems
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18. CONT…..
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19. REFERENCES
 [1] http://computer.howstuffworks.com/operating-system3.htm last
accessed on March,1,2015
 [2] http://en.wikipedia.org/wiki/Multi-user last accessed on March,1,2015
 [3] http://ecomputernotes.com/fundamental/disk-operating-
system/multitasking-operating-system last accesed on March,1,2015
 [4] http://en.wikipedia.org/wiki/Embedded_operating_system last accesed
on March,1,2015
 [5] http://www.techopedia.com/definition/30014/embedded-operating-
system last accesed on March,1,2015
 [6] http://searchdatacenter.techtarget.com/definition/real-time-operating-
system last accesed on March,1,2015
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20. QUERIES!!!
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