Warren Toomey from The Unix Heritage Society (TUHS) posts:<p><a href="http:&#x2F;&#x2F;minnie.tuhs.org&#x2F;pipermail&#x2F;tuhs&#x2F;2016-February&#x2F;006622.html" rel="nofollow">http:&#x2F;&#x2F;minnie.tuhs.org&#x2F;pipermail&#x2F;tuhs&#x2F;2016-February&#x2F;006622.h...</a><p>With the link:<p><a href="http:&#x2F;&#x2F;www.tuhs.org&#x2F;Archive&#x2F;PDP-11&#x2F;Distributions&#x2F;research&#x2F;McIlroy_v0&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.tuhs.org&#x2F;Archive&#x2F;PDP-11&#x2F;Distributions&#x2F;research&#x2F;Mc...</a><p>From the Readme:<p><pre><code>  The structure of the kernel source code is very similar to that of the 1st Edition Unix scan at

  http:&#x2F;&#x2F;www.tuhs.org&#x2F;Archive&#x2F;PDP-11&#x2F;Distributions&#x2F;research&#x2F;Dennis_v1&#x2F;PreliminaryUnixImplementationDocument_Jun72.pdf

  Here is what I can glean from the files:

  01-s1.pdf     contains the kernel source divided into sections S1 to S9
  02-hw.pdf     has hardware details of the PDP-7
  03-scope.pdf  has information about the PDP-7 scope
  04-cas.pdf    seems to be a user-mode program that uses the PDP-7 scope
  05-1-4.pdf    user-mode programs: adm, ald, apr, as
  06-5-12.pdf   user-mode programs: bl, bc, bi, cat, check, chown, chmod, cp, chrm
  07-13-19.pdf  user-mode programs: db, dmabs, ds, dsksav, dskres, dskio, dsw, init
  08-rest.pdf   user-mode programs: ed. Also at the beginning some B code (?)</code></pre>