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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. An RTOS is distinct from a time-sharing operating system, such as Unix , which manages the sharing of system resources with a scheduler, data buffers, or fixed task ...
The system can be operated in one of three modes: Real-Time, Multi-User, and Timesharing. [10]Multi-User shares the system with Real-Time tasks; Timesharing adds effective concurrent use of batch processing alongside "noncritical real-time tasks" and interactive users.
Interactive computing focuses on real-time interaction ("dialog") between the computer and the operator, and the technologies that enable them. [1] If the response of the computer system is complex enough, it is said that the system is conducting social interaction; some systems try to achieve this through the implementation of social interfaces.
The operating system provides an interface between an application program and the computer hardware, so that an application program can interact with the hardware only by obeying rules and procedures programmed into the operating system. The operating system is also a set of services which simplify development and execution of application programs.
The first interactive, general-purpose time-sharing system usable for software development, Compatible Time-Sharing System, was initiated by John McCarthy at MIT writing a memo in 1959. [17] Fernando J. Corbató led the development of the system, a prototype of which had been produced and tested by November 1961. [ 18 ]
AIX was the first operating system to implement a journaling file system. IBM has continuously enhanced the software with features such as processor, disk, and network virtualization , dynamic hardware resource allocation (including fractional processor units), and reliability engineering concepts derived from its mainframe designs.
MS-DOS (acronym for Microsoft Disk Operating System) is an operating system for x86-based personal computers mostly developed by Microsoft.Collectively, MS-DOS, its rebranding as IBM PC DOS, and some operating systems attempting to be compatible with MS-DOS, are sometimes referred to as "DOS" (which is also the generic acronym for disk operating system).
Later versions were termed INTERACTIVE UNIX System V/386 and based on System V 3.2, though with elements of BSD added. After its acquisition of Interactive, Sun Microsystems continued to maintain INTERACTIVE UNIX System, offering it as a low-end alternative to its System V.4-based Solaris , even when the latter had been ported to x86-based ...