2. Learning outcomes To know the tasks that an operating system
carriesout. To understand the reasons for needing
multi-useroperating systems To explain the Utility programs that
come with anoperating system 3. The 30 Second Challenge!Operating
SystemStarter 4. In a moment some terms to do with this topicwill
appear.You will have 30 seconds to memorise them.You will need to
write down as many ofthe terms as you can rememberAnd also a
definition or explanation of how that term relates to thetopic 5.
SchedulesCPU time 6. Write down as many terms as you canremember
and write a sentence about eachterm 7. SchedulesCPU time 8.
Operating systemsImagine you are a top computerprogrammer, but you
livein a world where operating systems do not exist - what wouldyou
need to do to make the computer run your application?The task of
looking after application software and hardware on acomputer is
given over to a piece of software called theOperating System 9.
Examples of Operating Systems Windows for personal computers (this
isthe most popular OS for home andbusiness users) Linux (Linux OSs
are open sourcewhich means that anybody can helpdevelop it and its
free, however it is moredifficult to use than Windows for
mostpeople) 10. Examples of Operating Systems Mac OS X This is the
OS used by Applecomputers Android This OS is used by manysmartphone
manufacturers(HTC, Samsung, Google) to operate theirphones. It was
originally developed byGoogle and is also open source. IOS This is
the OS used to operate aniPhone and was developed by Apple. IOSis
not open source. 11. What do they do? Loads and runs applications
-more than one application canrun at the same time(multitasking)
Sends data to the correct outputdevices such as monitor ormodem
Moves data to and from hard diskand other storage devices. 12. What
does an OS do? Communicates withperipherals such as printers It
provides a HumanComputer Interface (HCI) toallow people to use the
computerefficiently e.g. Windows interface Manages security such as
theuse of passwords. Logging inrequires the operating system 13.
What do they do? 14. TaskComplete questions 1-3 from the Operating
Systems task sheet 15. Multi-User Operating System Most Operating
systems are designed forsingle users in mind but allowing for
lotsof applications to be run at once (multi-tasking) Most PCs can
multi-task, however, sometimes people need aREALLY powerful
computer to do thejob. For example your are a scientist andyou need
to run a complicatedsimulation You are a film animator and want
towork in 3D 16. Multi User Operating System Most computers cant
handle these sorts oftasks, instead a mainframe orsupercomputer is
needed! Supercomputers cost millions of pounds tobuy and maintain
too expensive for a singleuser! This is why they have to be shared
bymany users and are called Multi-userMulti-tasking operating
systems 17. Multi User Operating SystemWith power equivalent to
175,000 laptops, ChinasTianhe-1A Supercomputer has been named the
fastestcomputer in the world, overtaking rival computers in the
U.S.and Germany. 18. Multi User Operating SystemThis diagram below
shows how a multi-user operating systemcan manage 3 people sharing
the power of one computer 19. Utility ProgramsAn operating system
also has other builtin programs to help you to look after
thecomputer. These help with: Compressing a file to save space
onbacking storage Recovering data from a damaged file Checking a
disk for faults and repairingthem Formatting a floppy disk Checking
the files on a disk forcomputer viruses 20. TaskComplete questions
4-7 from the Operating Systems task sheet 21. PlenaryTake this quiz
to test your knowledge onOperating Systems! 22. HomeworkCreate a
mind map about todays lesson!
