EDITED TO ADD:
I was out walking dogs and finished this post after others had posted since my last post.
The consensus reached on the board here was that ProtoTraveller was essentially
Bk 1-3
Part of Bk 4 (the ironmongery... and maybe the Mass Combat system.)
Adventures 1-4
Supplements 1-4
And maybe a couple of the DA's...
Sup 3 as released has almost no setting data. 1 page library data, 1-2 paragraphs per subsector. No sector book I've seen rivals its sparseness. The original printing even left out the zone markings on the maps!
Note that there were other ways to acquire the Bk 4 weapon tables; Judges' Guild's GM screen included the usage tables (but not stat mods), Snapshot included full stats.
Hi Wil and Rob,
I am familiar with the working definition of Proto-Traveller (and loved it when I bumped into it here a few years ago).
You are correct about the sparseness of S3. And the library dat of the adventures is light as well. And yet... The Ancient, other races, details about the Imperium are placed, even if lightly, throughout these products. (As you point out, S3 is particularly light, however.)
But even with that sparseness, S3 establishes "The Imperium," of 11,000 worlds which has lasted over a thousand years. That's pretty specific! But it isn't a given. Using the rules of LBBs 1-3, a Referee could create a setting along the lines of
Space Vikings which lacks a powerful centralized government. In this case the services of character generation would be local to specific planets or clusters of planets.
If we only look at LBBs 1-3 there are underlying assumptions, but the specifics of a setting are quite elastic. But the moment one introduces S3 and the adventures, lots of details start to get nailed down -- even if they are not as specific as what was to come after.
Given that Rob surprised me (and apparently Mike!) with his phrasing, so I just wanted to follow up.
If the point is "...to run Traveller with some setting other than the OTU..." my quick question would be, "Then introduce S3 and the Library Data from the Adventures at all?" Because the references, slight as they are, do start making a specific setting, which runs counter to "other than the OTU."
Simply using only LBBs 1-3 (with the aid, if one wishes of S1, S2, and S4 for additional open-ended resources and material), allows one to easily get to a setting other other than the OTU. (Certainly, that is my approach!) But it is exactly what LBBs 1-3 were built to do.
I'm not advocating for this, mind you. I simply want to grasp where Rob is drawing his line out of curiosity. (It's all arbitrary, after all, and everyone should be doing whatever they want with their own play no matter what!)