Evolution of Operating Systems

 

Era	Type of System	Key Characteristics	Examples
Early Systems	No Operating System	Manual operation, programs loaded and executed one at a time.	-
1950s-1960s	Batch Systems	Jobs collected and processed in batches without user interaction.	IBM 7094, UNIVAC systems
1960s-1970s	Interactive Systems	Real-time user interaction, time-sharing systems.	CTSS, Multics
1960s-1970s	Multiprogramming Systems	Multiple programs in memory, CPU switches between programs.	IBM OS/360
1970s	Time-Sharing Systems	Fixed time slices for each user/program, simultaneous interaction.	UNIX, TOPS-10
1960s-present	Real-Time Systems	Timely data processing and responses, critical environments.	VxWorks, QNX
1980s-present	Personal Computer Operating Systems	User-friendly interface, supports wide range of applications.	MS-DOS, Windows, macOS, Linux
1980s-present	Networked and Distributed Systems	Resource sharing over networks, appear as single system.	NFS, DCE
1990s-present	Modern Operating Systems	Multitasking, multiprocessing, security, multimedia support.	Windows 10/11, macOS, Linux, Android, iOS
2000s-present	Cloud and Mobile Operating Systems	Operate over internet (cloud), optimized for mobile devices.	Google Chrome OS (cloud), Android, iOS

This table summarizes the key eras, types, characteristics, and examples of operating systems throughout their evolution.