Based onLinux kernel programming ，use 8253 playing a musical 。

8253\Makefile
....\music.c
....\time
....\timer.c
....\timerk.c
....\a\.speaker.o.d
....\.\Makefile
....\.\music.c
....\.\speaker.c
....\.\speaker.doc
....\.\speaker.h
....\.\spk.c
....\sound\app.c
....\.....\app.c~
....\.....\bat
....\.....\led.c
....\.....\led.o
....\.....\Led_head.h
....\.....\m
....\.....\m.elf
....\.....\m.gdb
....\.....\Makefile
....\.....\sound.c
....\.....\sound.c~
....\.....\sound.o
....\.....\speaker.h
....\.....\speaker.h~
....\.....\test
....\.....\test.c
....\.....\led\.led.c.swp
....\.....\...\test.c~
....\a\.tmp_versions
....\sound\led
....\a
....\sound
8253

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