HackerThe step-by-step, mechanical logic of old pinball machines
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机电弹珠机用继电器和计分电机把一连串动作排出次序。下一球开始前，上一球触发的状态有些必须清掉；「重新开始」因此是一段检查和复位流程，而不只是把分数显示换掉。
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with a few relays and a wacky contraption called the score motorit also needs to reset any of the relays that might have been triggered in the last ball