根据实验提供的音乐频率表和时间表，编写程序控制8254，使其输出连接到扬声器上能发出相应的乐曲。
Music provided by the experimental frequency table and schedules, programming control of 8254, its output is connected to the speakers can be issued the appropriate music.
根据实验提供的音乐频率表和时间表，编写程序控制8254，使其输出连接到扬声器上能发出相应的乐曲。
Music provided by the experimental frequency table and schedules, programming control of 8254, its output is connected to the speakers can be issued the appropriate music.
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