Buzzer drive experiment using P1 port of the microcontroller to do I/O port, and make use of the user learns buzzer

实验4\C51\EX
.....\...\EX.C
.....\...\EX.LNP
.....\...\EX.M51
.....\...\EX.Opt
.....\...\EX.PLG
.....\...\EX.UV2
.....\...\EX3.Opt
.....\...\EX_Opt.Bak
.....\...\Ex.LST
.....\...\Ex.OBJ
.....\...\STARTUP.A51
.....\...\STARTUP.LST
.....\...\Startup.OBJ
.....\BELL\HAPPY.ASM
.....\....\Happy.LST
.....\....\Happy.OBJ
.....\....\MUSIC
.....\....\MUSIC.HEX
.....\....\MUSIC.LNP
.....\....\MUSIC.M51
.....\....\MUSIC.PLG
.....\....\README.TXT
.....\....\Startup.OBJ
.....\....\buzz.Opt
.....\....\buzz.Uv2
.....\....\buzz_Opt.Bak
.....\....\buzz_Uv2.Bak
.....\C51
.....\BELL
实验4

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