====== First Edition Unix ======

**Release Date:** November 1971\\
**Released By:** Bell Labs Research\\
**Source Code: ** [[http://www.tuhs.org/Archive/Distributions/Research/Dennis_v1/svntree-20081216.tar.gz|svntree-20081216.tar.gz]] in the [[http://www.tuhs.org/Archive/Distributions/Research/Dennis_v1/|Unix Archive]], browsable in the [[http://www.tuhs.org/cgi-bin/utree.pl?file=V1|Unix Tree]]\\
**Documentation: ** [[http://www.tuhs.org/Archive/Distributions/Research/Dennis_v1/UNIX_ProgrammersManual_Nov71.pdf|1st Edition man pages]]

The first edition of Unix was developed for the PDP-11/20 at Bell Labs by Ken Thompson, Dennis Ritchie and others. It provided a process-oriented multitasking environment with a hierachical filesystem for about two or three users.

The source code for the kernel came from a document entitled [[http://www.tuhs.org/Archive/Distributions/Research/Dennis_v1/PreliminaryUnixImplementationDocument_Jun72.pdf|Preliminary Release of Unix Implementation]]. Al Kossow from the Computer History Museum unearthed a paper copy of the document, scanned it in and donated it. The manual pages were OCR'd by Dennis Ritchie.

For more information about First Edition Unix, see [[https://www.bell-labs.com/usr/dmr/www/hist.html|The Evolution of the Unix Time-sharing System]] by Dennis Ritchie.