Gray Chang (creator of Claim Jumper, Dog Daze, and others) sent me a box of interesting things!
(I had interviewed him for the ANTIC podcast: http://ataripodcast....than-halliday )
In the box I found an version of the Atari 400/800 Operating System Users Manual dated November 1980. The official published version is dated 1982. This version seems to be an internal-use-only version from before the days when Atari decided that releasing developer documentation was a smart idea.
I scanned it for you: https://archive.org/...ualNovember1980
Also in the box: the Atari Computer System Hardware Manual, also from November 1980, also a year or two before the official version was published. I scanned it for you: https://archive.org/...ualNovember1980
Also also: a pre-release version of De Re Atari, probably also from 1980 or 1981. I scanned it too: https://archive.org/...i_early_version
These all have lots of Grays notes handwritten on them.
I did a quick spot-check and noticed that some of the books are significantly different in the order of material presented. Some charts and graphs are hand-drawn, where they were replaced with more professional looking versions in the published editions. I haven't compared the text closely - I have no idea if these contain any secrets that were redacted from the published versions. I can't wait for ya'll to find out.
As far as I know, none of these have been made available online until now.
Here's a bonus: the Atari Company Store Price List, dated August 24, 1981 -- https://archive.org/...yStorePriceList
He ALSO sent disks which apparently contain the source code to (at least) Claim Jumper and Dog Daze Deluxe. I haven't dug into that yet, but will make it available once I have sorted them out.
Gray sent a little something for me, too.