Yumiko Sugita

Organization of a real-time operating system “A-RMS”

As technologies in the process control and the equipment control fields become more and more advanced, there are increasing needs for a real time operating system which provides the interactive processing function in addition to the conventional control function. In the past, as a means to cope with these needs, technologies such as the virtual machine system of the emulation system were proposed. However, these systems presented difficulties in handling because each environment in these conventional systems uses its own operating system interface. This paper describes “A-RMS,” a newly developed real-time operating system which incorporates an interactive processing function as native on top of a real-time operating system providing a control function. The control function and the interactive processing function are realized with unified concept and specification in A-RMS. Adverse effects on the control function which might be induced by the incorporated interactive processing function are prevented by introducing a concept of environment to separate the interactive processing function from the control function. The new operating system is implemented on the M68010. This paper also mentions the effect of incorporation of the interactive processing function on A-RMS performance. To secure response, A-RMS employs only the real memory. The memory management unit (MMU) is used exclusively for memory protection.