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+====== Sixth Edition Unix ======
+**Release Date:** May 1975\\
+**Released By:** Bell Labs Research\\
+**Source Code: ** [[http://www.tuhs.org/Archive/PDP-11/Distributions/research/Dennis_v6/v6src.tar.gz|v6src.tar.gz]] in the [[http://www.tuhs.org/Archive/PDP-11/Distributions/research/Dennis_v6/|Unix Archive]], browsable in the [[http://minnie.tuhs.org/cgi-bin/utree.pl?file=V6|Unix Tree]]\\
+**Documentation: ** [[http://www.tuhs.org/Archive/PDP-11/Distributions/research/Dennis_v6/v6doc.tar.gz|6th Edition man pages]]
+The Sixth Edition of Unix was released by Bell Laboratories in May 1975.
+It was designed to run on the PDP-11s with 18-bit addressing such as the PDP-11/40, 11/45 and 11/70. The kernel's image size was around 29 Kbytes. This edition introduced the `Portable C Library' written by Mike Lesk, which would evolve into the Standard I/O library.
+For more information about Sixth Edition Unix, see [[http://cm.bell-labs.com/cm/cs/who/dmr/retro.html|The Unix Time-sharing System: A Retrospective]] by Dennis Ritchie.