Operating system

Computers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Software ,[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Relationship between software and hardware Hardware System software Application software ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

System Software Operating System ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Role/Importance of OS ,[object Object],[object Object],Dilfaroz A Khan

Role of OS cont… ,[object Object],[object Object],[object Object],Users Application Software Operating and systems software Hardware Dilfaroz A Khan

Major functions of OS ,[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Processor management ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Processor management cont…. ,[object Object],[object Object],[object Object],Dilfaroz A Khan

Processor management cont…. ,[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Processor management cont…. ,[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Memory Management ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Single Size Allocation ,[object Object],[object Object],[object Object],[object Object],OS Users program Wasted MEMORY Dilfaroz A Khan

Fixed Size Allocation ,[object Object],[object Object],[object Object],OS MEMORY 20 K 20 K 20 K OS 20 K 10 K 40 K Dilfaroz A Khan

Variable Size Partition Allocation (Re Allocation) ,[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Variable size allocation cont…. Dilfaroz A Khan

Virtual Storage ,[object Object],[object Object],[object Object],Dilfaroz A Khan

Paging in virtual memory Dilfaroz A Khan

Disadvantage of Virtual Storage ,[object Object],[object Object],[object Object],Dilfaroz A Khan

Device Management ,[object Object],[object Object],[object Object],Dilfaroz A Khan

Device Management cont…. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Device Management cont…. ,[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Information/File Management ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Command Interface character user / graphic user interface ,[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Command line interface ,[object Object],[object Object],[object Object],Dilfaroz A Khan

Graphic User Interface ,[object Object],[object Object],Dilfaroz A Khan

Booting – ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Windows ,[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Windows ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Windows ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

UNIX ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Linux ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dilfaroz A Khan

Comparison GUI and CUI Dilfaroz A Khan GUI CUI Symbols, pictures and pointing commands are use to execute commands Set of characters and words are used to execute the commands No need to remember the command. A small practice enables you to use the commands The syntax and various options are required to be remembered. General menu structure and commands are used for all the applications. Different application have their own set of commands. Number of applications can be opened and executed in different window at the same time Only one application can run at a time Minimum use of keyboard Maximum use of keyboard Mouse extensively used Mouse used only in some applications Easy to operate Not user friendly hence difficult to operate

Key words. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],2. Multi processing: - it is used to describe a system where by two or more interconnected CPU’s perform several simultaneously. - It is also called Parallel Processing. - the CPU is capable of executing different instructions from the same program at the same time. - Assigning different jobs to CPU’s is possible. Dilfaroz A Khan

Key words. 3. Multitasking : - is the name given to the concurrent execution of two or more user tasks by the same computer. - It place two or more task in the main memory and concurrently executes them Dilfaroz A Khan

Operating system

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Operating system