Operating System

How the programming of different generation is superior as compared to their previous generation?
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Operating system generation is divided in 5 eras.
  1. 1942-1954. Vaccum tube based.
  2. 1952-1964 Transistor based
  3. 1964-1972. Integrated Circuit based
  4. 1972-1990. VLSI microprocessor based.
  5. 1990-onwards.ULSI microprocessor based
Thier comparison and more details at http://www.docsity.com/en/evolution-of-operating-systems-advanced-operating-system-lecture-slides/283446/
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