Wow, for an operating system written in C, that's a lot of assembly! (Apparently, unix was actually <i>re</i> written in C a little later.)<p>Interesting to see the implementation of something like printf though: <a href="http://code.google.com/p/unix-jun72/source/browse/trunk/src/lib/printf.c" rel="nofollow">http://code.google.com/p/unix-jun72/source/browse/trunk/src/...</a>