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--- systems:pdp7_unix [2019/12/01 13:33] – [PDP-7 Unix] frank
+++ systems:pdp7_unix [2023/02/16 08:04] (current) – admin
@@ Line 4: / Line 4: @@
 **Released By:** Never released outside of Bell Labs\\
 **Source Code:** [[https://github.com/DoctorWkt/pdp7-unix|Reconstructed from original listings]]\\
-**Documentation:** [[https://github.com/DoctorWkt/pdp7-unix|Reconstructed from original listings]]**
+**Documentation:** [[https://github.com/DoctorWkt/pdp7-unix|Reconstructed from original listings]]
 Ken Thompson began the development of the system that was to become Unix, first as a file system on paper and then on a "little-used PDP-7" (Dennis Ritchie, [[https://www.bell-labs.com/usr/dmr/www/hist.html|The Evolution of the Unix Time-sharing System]]).
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 ===== Extant PDP-7 Unix Source Code =====
-For many years, the only extant source code from the PDP-7 version of Unix appeared to be the source code to the //dsw//  command that Dennis [[http://minnie.tuhs.org/pipermail/pups/1999-November/000139.html|posted on the net.unix-wizards]] Usenet newsgroup in 1984. He wrote:
+For many years, the only extant source code from the PDP-7 version of Unix appeared to be the source code to the //dsw//  command that Dennis [[http://www.tuhs.org/pipermail/pups/1999-November/000139.html|posted on the net.unix-wizards]] Usenet newsgroup in 1984. He wrote:
 I happened to dredge up an old notebook and found a listing of the PDP-7 version of dsw. Because several people have approached me recently about reviving a version of PDP-7 Unix as a sort of paleontological exhibit, and because the subject has been discussed here, I thought people might be interested in seeing the code. I first considered net.sources, but decided not to carry whimsy too far.
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 ===== PDP-9 Unix =====
-In several places, including the [[http://www.tuhs.org/Archive/Documentation/Papers/unix_cacm74.pdf|CACM paper]], there is mention made of Unix running on a PDP-9. Dennis Ritchie posted [[http://minnie.tuhs.org/pipermail/pups/2002-August/000529.html|a message on the PUPS mailing list]] in August 2002 which said:
+In several places, including the [[http://www.tuhs.org/Archive/Documentation/Papers/unix_cacm74.pdf|CACM paper]], there is mention made of Unix running on a PDP-9. Dennis Ritchie posted [[http://www.tuhs.org/pipermail/pups/2002-August/000529.html|a message on the PUPS mailing list]] in August 2002 which said:
 The [PDP-]7, 9, 15 were very compatible.  I think the -15 had some scheme for using an index register, which the earlier ones didn't have, but it was otherwise pretty much identical in IS architecture.