Operating Systems       

Operating Systems have evolved from the very first IBM systems that managed which batch job would run to sophisticated systems that manage where a virtual machine resides on a cloud and manages both the security and the updates to applications in a very reliable way.

1. 1966:  Optimal Replacement in Caching Systems
2. 1968:  Virtual Machines
3. 1987:  Logical Volume Management
4. 1990:  Journaled File Systems
5. 1994:  Cluster of Computers Appear as a Single Host on a Network
6. 1995:  Scheduling in Time-Shared Systems
7. 1999:  First Computer Systems Company to Embrace Linux

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