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+====== Fourth Edition Unix ======
+**Release Date:** November 1973\\
+**Released By:** Bell Labs Research\\
+**Source Code: ** a kernel which predates 4th Edition is [[http://www.tuhs.org/Archive/PDP-11/Distributions/research/Dennis_v3/nsys.tar.gz|nsys.tar.gz]] in the [[http://www.tuhs.org/Archive/PDP-11/Distributions/research/Dennis_v3/|Unix Archive]]\\
+**Documentation: ** [[http://www.tuhs.org/Archive/PDP-11/Distributions/research/Dennis_v4/v4man.tar.gz|4th Edition man pages]], browsable in the [[http://minnie.tuhs.org/cgi-bin/utree.pl?file=V4|Unix Tree]]
+The fourth edition of Unix was the first version to have a kernel written in a high level language, C, along with some of the commands. A full and complete copy of Fourth Edition no longer exists. We have:
+  * The manuals for Fourth Edition in machine-readable format, and
+  * A copy of the earliest extant kernel in C, the "nsys" kernel, which pre-dates the actual Fourth Edition by only a few months.
+The "nsys" kernel was donated by Dennis Ritchie. This is a version of the kernel quite close to that released in Fourth Edition, but without pipes. Dennis Ritchie writes:
+This is a tar archive derived from a DECtape labelled "nsys". What is contains is just the kernel source, written in the pre-K&R dialect of C. It is intended only for PDP-11/45, and has setup and memory-handling code that will not work on other models (it's missing things special to the later, smaller models, and the larger physical address space of the still later 11/70.) It appears that it is intended to be loaded into memory at physical address 0, and transferred to at location 0.
+For more information about Fourth Edition Unix, see [[http://cm.bell-labs.com/cm/cs/who/dmr/hist.html|The Evolution of the Unix Time-sharing System]] by Dennis Ritchie.