Abstract
A low cost (IBM/PC microcomputer based) computer numerical controller has been developed and successfully adapted for use in a three-axis milling machine application. The heart of this system is a simple, yet powerful real-time multitasking operating system environment (termed RTX) that was developed as a real-time extension to the standard disk operating system (DOS). Basically, RTX acts as an interrupt driven priority based round-robin scheduler running in the background under DOS. The scheduler is extremely efficient since it is not called at a pre-determined frequency but is called upon demand by the hardware timer of the priority level requesting service. Since the processes running on a given priority level can dynamically set the interrupt rate of the hardware timers, the frequency of execution of the scheduler is infinitely variable. The implementation of RTX for the CNC controller uses three priority levels; however the design philosophy is generic and can be extended to accommodate most system requirements.
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