所有音乐都是由各个不同频率的音阶和其延续时间的长短来实现的。不同的音乐是由各个音阶按某种排列各自播放一定时间形成的，将各音乐音阶和其延续时间存在数据段中，然后根据不同按键值选择不同的音阶和时间表，再使用计数器产生该音阶频率。而我们学过的有计数器可以产生各种频率，所以我们主要采用计数器8253产生各音符，用8255并行接口来控制扬声器的开关，达到播放音乐的功能。-All music are by different frequency scale and the length of its duration is achieved. Music is different from the various scales according to some of their players with the formation of a certain period of time for each of the musical scale and duration of the existence of its data segment, and then depending on the value button to select a different scale and timetable, and then have the use of counter scale frequency. And we learned there can produce a variety of frequency counters, so we mainly produce the note counter 8253, with 8255 parallel interface to control the speaker s switch to play the music functions.