Talk:Incompatible Timesharing System

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Revision as of 13:44, 30 January 2018 by Larsbrinkhoff (talk | contribs) (PCLSRing on SDS 940 OS?)
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I'm pretty sure that by the time I got to Tech Sq (in 1977), the PDP-6 was no longer in use. It wasn't physically removed until some years later, though. Jnc (talk) 15:43, 14 December 2017 (CET)

Right. I have collected all information I have found on each of the classical ITS machines here: [1], but I figured it was too much for this page. User:Larsbrinkhoff 18:14, 14 December 2017 (CET)


Comment on "after Multics was done". I believe both Multics and ITS were developed around the same time. User:Larsbrinkhoff 11:11, 15 December 2017 (CET)

Well, the planning for Multics I believe started first; 1964 or so (the timeline on the Multicians site doesn't give the exact date, but they selected GE in 1964, so it was certainly underway then). The first boot of a Multics came in December '67. As for ITS, the AI Lab history, "A Marriage of Convenience: The Founding of the MIT Artificial Intelligence Laboratory" implies that it was started, and finished, sometime in '67, on a PDP-6 already owned by the Lab, but no specific date is given. Jnc (talk) 14:49, 15 December 2017 (CET)
It seems right that Multics implementation started well before that of ITS. But they become operational at about the same time; actually ITS was first. Project MAC Progress Report IV has this to say: "A time-sharing system for the PDP-6 went into operation in July 1967." User:Larsbrinkhoff 15:31, 15 December 2017 (CET)
Good find! I'll add that to the article. Jnc (talk) 15:43, 15 December 2017 (CET)


I found this posted to alt.sys.pdp10: "The [TENEX] exception model for system calls was as ugly as their hardware, instead of adopting an ITS-like PCLSR approach - another step backwards from the 940 system, which in essence had simplified PCLSR." Larsbrinkhoff (talk)