TYPES OF SYSTEM (page-4)

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6.Real Time System

Real time system is defines as a data processing system in which the time interval required to process and respond to inputs is so small that it controls the environment.

Real time processing is always on line whereas on line system need not be real time.

The time taken by the system to respond to an input and display of required updated information is termed as response time.

So in this method response time is very less as compared to the online processing. Real-time systems are used when there are rigid time requirements on the operation of a processor or the flow of data and real-time systems can be used as a control device in a dedicated application.

Real-time operating system has well-defined, fixed time constraints otherwise system will fail.

For example Scientific experiments, medical imaging systems, industrial control systems, weapon systems, robots, and home-applicance controllers, Air traffic control system etc.


There are two types of real-time operating systems.

Hard real-time systems

Hard real-time systems guarantee that critical tasks complete on time. In hard real-time systems secondary storage is limited or missing with data stored in ROM.

In these systems virtual memory is almost never found.

Soft real-time systems

Soft real time systems are less restrictive. Critical real-time task gets priority over other tasks and retains the priority until it completes.

Soft real-time systems have limited utility than hard real-time systems.

For example, Multimedia, virtual reality, Advanced Scientific Projects like undersea exploration and planetary rovers etc.

7.Handheld Systems

Hanheld Systems are also called as Embedded operating systems.This operating systems are designed to be used in embedded computer systems. They are designed to operate on small machines like PDAs with less autonomy. They are able to operate with a limited number of resources. They are very compact and extremely efficient by design. Windows CE and Android are some examples of embedded operating systems.

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