Nachos implement.

code\build.cygwin\Makefile
....\............\Makefile.dep
....\......linux\a
....\...........\addrspace.o
....\...........\alarm.o
....\...........\b
....\...........\bitmap.o
....\...........\console.o
....\...........\debug.o
....\...........\directory.o
....\...........\disk.o
....\...........\DISK_0
....\...........\exception.o
....\...........\filehdr.o
....\...........\filesys.o
....\...........\interrupt.o
....\...........\kernel.o
....\...........\libtest.o
....\...........\machine.o
....\...........\main.o
....\...........\Makefile
....\...........\Makefile.dep
....\...........\Makefile~
....\...........\mipssim.o
....\...........\nachos
....\...........\network.o
....\...........\openfile.o
....\...........\pbitmap.o
....\...........\post.o
....\...........\scheduler.o
....\...........\stats.o
....\...........\switch.o
....\...........\swtch.s
....\...........\synch.o
....\...........\synchconsole.o
....\...........\synchdisk.o
....\...........\sysdep.o
....\...........\test
....\...........\test~
....\...........\thread.o
....\...........\timer.o
....\...........\translate.o
....\......macosx\Makefile
....\............\Makefile.dep
....\filesys\directory.cc
....\.......\directory.cc~
....\.......\directory.h
....\.......\directory.h~
....\.......\filehdr.cc
....\.......\filehdr.cc~
....\.......\filehdr.h
....\.......\filehdr.h~
....\.......\filesys.cc
....\.......\filesys.cc~
....\.......\filesys.h
....\.......\filesys.h~
....\.......\openfile.cc
....\.......\openfile.cc~
....\.......\openfile.h
....\.......\openfile.h~
....\.......\pbitmap.cc
....\.......\pbitmap.h
....\.......\synchdisk.cc
....\.......\synchdisk.h
....\lib\bitmap.cc
....\...\bitmap.h
....\...\copyright.h
....\...\debug.cc
....\...\debug.h
....\...\hash.cc
....\...\hash.h
....\...\libtest.cc
....\...\libtest.h
....\...\list.cc
....\...\list.cc~
....\...\list.h
....\...\sysdep.cc
....\...\sysdep.h
....\...\sysdep.h~
....\...\tut.h
....\...\tut_reporter.h
....\...\tut_restartable.h
....\...\utility.h
....\machine\callback.h
....\.......\console.cc
....\.......\console.h
....\.......\disk.cc
....\.......\disk.h
....\.......\interrupt.cc
....\.......\interrupt.h
....\.......\machine.cc
....\.......\machine.h
....\.......\mipssim.cc
....\.......\mipssim.h
....\.......\network.cc
....\.......\network.h
....\.......\stats.cc
....\.......\stats.h
....\.......\timer.cc
....\.......\timer.h

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