File list (Check if you may need any files):
key4x4_C\4X4矩阵键盘C程序.rar
........\................\4X4矩阵键盘C程序\4X4.c
........\................\................\STARTUP.A51
........\................\................\tetrtrew.plg
........\................\................\STARTUP.LST
........\................\................\tetrtrew.lnp
........\................\................\tetrtrew.M51
........\................\................\STARTUP.OBJ
........\................\................\tetrtrew.hex
........\................\................\4X4.LST
........\................\................\4X4.OBJ
........\................\................\tetrtrew_Uv2.Bak
........\................\................\tetrtrew.Uv2
........\................\................\tetrtrew_Opt.Bak
........\................\................\tetrtrew.Opt
........\................\4X4矩阵键盘C程序
........\4X4矩阵键盘C程序
key4x4_C