矩阵键盘
........\keil c
........\......\keyboard
........\......\keyboard.c
........\......\keyboard.hex
........\......\keyboard.lnp
........\......\keyboard.LST
........\......\keyboard.M51
........\......\keyboard.OBJ
........\......\keyboard.Opt
........\......\keyboard.plg
........\......\keyboard.Uv2
........\......\keyboard_Opt.Bak
........\......\keyboard_Uv2.Bak
........\proteus
........\.......\矩阵键盘.DSN