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what is difference between overlays and virtual memory? are both transparent to user?

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Both are memory management techniques.

But in case of overlays whole system memory management is done by programmer ,But in case of paging operating system has the responsibility of managing system memory .

Have a look at it 

http://8051-microcontrollers.blogspot.in/2015/01/memory-virtual-memory-overlays-and.html#.VZYSmPmqqko

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