File list (Check if you may need any files):
第6章 实现4×4键盘输入
......................\proc
......................\....\STARTUP.A51
......................\....\STARTUP.OBJ
......................\....\STARTUP.lst
......................\....\Timer.LST
......................\....\Timer.OBJ
......................\....\Timer.c
......................\....\key4x4
......................\....\key4x4.M51
......................\....\key4x4.Opt
......................\....\key4x4.Uv2
......................\....\key4x4.plg
......................\....\main.LST
......................\....\main.OBJ
......................\....\main.c
......................\电路原理图
......................\..........\KB4x4.SchDoc
......................\..........\KB4x4R.SchDoc
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