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<p>The development of an operating system that is a central component of a fault-tolerant multiprocessor is described. The operating system, while relatively simple and small, supports multitasking and multiprocessing, as well as both self-diagnostics and cross-diagnostics for fault detection. In the event of a fault, the system permits rapid reconfiguration in a manner that retains processing for the highest-priority tasks. Since the hardware needed to provide fault tolerance is available when there are no faults, the operating system can utilize this excess capacity to accomplish lower-priority tasks during normal operation. This approach yields graceful degradation in response to faults in the system components.</p>

B. W. Johnson, T. E. Roberts and R. D. Williams, "An Operating System for a Fault-Tolerant Multiprocessor Controller," in IEEE Micro, vol. 8, no. , pp. 18-29, 1988.
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