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An operating system is difficult to define, [7] but has been called "the layer of software that manages a computer's resources for its users and their applications". [8] ...
These tables provide a comparison of operating systems, of computer devices, as listing general and technical information for a number of widely used and currently available PC or handheld (including smartphone and tablet computer) operating systems.
Timeline showing releases of Windows for personal computers and servers. Microsoft Windows is a computer operating system developed by Microsoft.It was first launched in 1985 as a graphical operating system built on MS-DOS.
DOS releases have been in the forms of: OEM adaptation kits (OAKs) – all Microsoft releases before version 3.2 were OAKs only; Shrink wrap packaged product for smaller OEMs (system builders) – starting with MS-DOS 3.2 in 1986,
Structure of monolithic kernel, microkernel and hybrid kernel-based operating systems. A distributed OS provides the essential services and functionality required of an OS but adds attributes and particular configurations to allow it to support additional requirements such as increased scale and availability.
A real-time operating system (RTOS) is an operating system (OS) for real-time computing applications that processes data and events that have critically defined time constraints.
Evolution of Unix and Unix-like systems, starting in 1969. A Unix-like (sometimes referred to as UN*X, *nix or *NIX) operating system is one that behaves in a manner similar to a Unix system, although not necessarily conforming to or being certified to any version of the Single UNIX Specification.
Structure of monolithic kernel, microkernel and hybrid kernel-based operating systems A monolithic kernel is an operating system architecture with the entire operating system running in kernel space.