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本文介绍了一个基于ISA总线的看门狗（Watch－Dog）接口板的设计思想和工作原理，并提出用冗余法对程序运行状态标志的保护来达到用软硬件相结合的方法提高系统的可靠性。
This article introduces the design concept and working principle of a Watch-Dog interface board based on ISA bus. It also proposes to use software and hardware to improve the system’s protection by using the redundancy method to protect the program running status mark. reliability.