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To observe the performance of PC based robot manipulator under general purpose (Windows), Soft (Linux) and Hard (RT Linux) Real Time operating systems (OS). The same open loop system is observed in different operating system under multitasking environment. The Data Acquisition (DAq, PCL-812PG) card is used as a hardware interface. This experiment shows that the real time error (Jitter) is minimum in RT-Linux operating system than any other Soft Real-Time operating systems. Delay analysis of this supervisory system is calculated in RT-Linux operating system.