Operating systems that can totally ensure a maximum time for operations like OS calls and interrupt handling usually are called “hard real-time”. Any of the processes can execute in the CPU if a process has a time slice. The measure of processing time requirements is in tenths of seconds or shorter. Asma’a Lafi 1 2. Even with a similar name it is not related the Real-Time Linux project of the Linux Foundation. Summary – Hard vs Soft Real Time System This article discussed two types of real time operating systems; the hard real time systems and the soft real time systems. There are several advantages and disadvantages of having a real time operating system. They may be microseconds or weeks. Distributed Operating System is one of the important type of operating system. A Real Time Operating System is the type of operating system that is designed to serve real time applications or embedded applications. Examples: Air bag control in cars, anti-lock brake, engine control system etc. Some real-time operating systems watch just like the hard real-time operating system. I remember writing a real-time operating system (RTOS) for a cardiac pacemaker that had 32kB of static memory for what amounted to an embedded 6502 processor. SICE Journal of Control, Measurement, and System Integration, Vol.5, No.1, pp. Recent. There are two types of real-time operating systems. The usefulness of a result is zero after its deadline. Operating System RTOS v. OS – Advantages and Disadvantages. The operating system may keep a list of free pages in its memory, or may choose to probe the memory each time a request is made (though most modern operating systems do the former). The full form of RTOS is Real time operating system. Processing time requirements (including any OS delay) are measured in tenths of seconds or shorter increments of time. Advantages of Real Time EtherCAT Real time EtherCAT has emerged as the most adaptable and fastest Ethernet field bus for industrial use. In real time operating system there is a little swapping of programs between primary and secondary memory.Most of the time, processes remain in primary memory in order to provide quick response, therefore, memory management in real time system is less demanding compared to other systems.. Time Sharing Operating System is based on Event-driven and time-sharing the design. This system reschedules and completes a job if it has passed its deadline. In hard RTOS, the deadline is addressed strictly. It should also be noted that many applications that must run for extended periods of time can benefit from the reliability that an RTOS can provide. Also RTOS are used in aircrafts i.e. Figure: Hard Real-Time Operating Systems RTOS Soft real-time operating systems. Hard Real Time operating system: These operating systems guarantee that critical tasks be completed within a range of time. Real-time systems are used when there are very strict time needs like missile systems, robots etc. Figure: Time-sharing operating systems Each process is assigned a small amount of time, and this time is known as Time slice. Round Robin scheduling is a very famous scheduling algorithm of a time-sharing system. Such applications include embedded systems, industrial robots, scientific research equipment and others. They are Hard Real Time, Firm Real Time, and Soft Real Time. In a RTOS, Processing time requirement are calculated in tenths of seconds increments of time. The official definition of real-time computing is a task that is executed within a given time, giving a deterministic system. 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