PPT Slide

Evolution of OS

• Serial processing (1950s)

• Simple batch systems (early1960s)

• Multiprogrammed systems (mid 1960's)

• Multimode timesharing systems (1970s')

• Distributed systems (1980s, 1990s)

Use\OS

Uniprograming

Multiprograming

processor

17%

33%

memory

30%

67%

disk

33%

67%

printer

33%

67%

throughput

6 jobs/hr

12 jobs/hr

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