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文章提出一种非常实用的学校上下课打铃的微机控制系统。此系统的特点是能通过接收广播电台的报时信号使机内电子钟与北京时间保持同步。所以无需对时，对学校上下课准时打铃提供了可靠的保证。
The article presents a very practical computer control bell ringing the school system. The characteristic of this system is that it can keep the electronic clock in the machine synchronized with Beijing time by receiving the time signal of the broadcasting station. So no need to be on time, the school punctual punctuality provides a reliable guarantee.