矩阵键盘按键键值显示程序
........................\ex77
........................\ex77.c
........................\ex77.hex
........................\ex77.lnp
........................\ex77.LST
........................\ex77.M51
........................\ex77.OBJ
........................\ex77.Opt
........................\ex77.plg
........................\ex77.Uv2
........................\ex77_Opt.Bak
........................\ex77_Uv2.Bak