huangshan\123a.doc .........\AT89S51单片机试验及.doc .........\Proteus仿真51单片机辅助学习单片机I.doc .........\proteus,仿真.doc .........\sy9.doc .........\多位数码管动态显示.doc .........\用AT89C51的I3个8255的实例教程.doc huangshan