{"action":"created","issue":{"url":"https://api.github.com/repos/PDP-10/-READ--THIS-/issues/5","repository_url":"https://api.github.com/repos/PDP-10/-READ--THIS-","labels_url":"https://api.github.com/repos/PDP-10/-READ--THIS-/issues/5/labels{/name}","comments_url":"https://api.github.com/repos/PDP-10/-READ--THIS-/issues/5/comments","events_url":"https://api.github.com/repos/PDP-10/-READ--THIS-/issues/5/events","html_url":"https://github.com/PDP-10/-READ--THIS-/issues/5","id":200874781,"number":5,"title":"PDP-6 machines","user":{"login":"aap","id":1521437,"avatar_url":"https://avatars.githubusercontent.com/u/1521437?v=3","gravatar_id":"","url":"https://api.github.com/users/aap","html_url":"https://github.com/aap","followers_url":"https://api.github.com/users/aap/followers","following_url":"https://api.github.com/users/aap/following{/other_user}","gists_url":"https://api.github.com/users/aap/gists{/gist_id}","starred_url":"https://api.github.com/users/aap/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/aap/subscriptions","organizations_url":"https://api.github.com/users/aap/orgs","repos_url":"https://api.github.com/users/aap/repos","events_url":"https://api.github.com/users/aap/events{/privacy}","received_events_url":"https://api.github.com/users/aap/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":3,"created_at":"2017-01-15T15:25:44Z","updated_at":"2017-01-16T17:57:14Z","closed_at":null,"body":"There are now two issues about information and photos/videos of ITS machines in the ITS repo. In addition @philbudne has a list of of PDP-6s here: http://www.ultimate.com/phil/pdp10/pdp6-serials.html\r\nI open this issue to have a discussion not tied to ITS about this here.\r\n\r\n### \\# 1\r\nI wanted to mention that the image at the top of phil's page (of which there was a higher res version somewhere - i have it [here](http://pdp-6.net/photos/pdp6.jpg)) looks not at all like the final PDP-6. It seems to be the prototype described in [this](http://bitsavers.trailing-edge.com/pdf/dec/pdp6/F-61_PDP-6_Brochure_5-63.pdf) brochure. I mailed Gordon Bell about it some time ago but he said\r\n> There was no such a thing as a proto. [...]\r\n> No 1 was used as our development machine.\r\n\r\nI'm not really sure how to interpret this.\r\n\r\n### \\# 2\r\nThere are quite a few videos on https://www.csail.mit.edu/videoarchive/history/aifilms/\r\nthat show the MIT PDP-6 and it's robot arms and whatnot.\r\n\r\n### \\# 4\r\nI would also like to add a photo of the UWA PDP-6: http://www.iucr.org/__data/assets/image/0005/57677/1967_UWA_PDP6.jpg ([source](http://www.iucr.org/gallery/undated/australian-crystallographers?result_57457_result_page=3))\r\nAnd I was sent photos of the remains of the front panel of this machine by Peter Dreisiger (photos by Alex Reid):\r\nhttp://pdp-6.net/images/pdp6_1.jpg\r\nhttp://pdp-6.net/images/pdp6_2.jpg\r\n\r\nI find this machine particularly puzzling. The indicator panel in bay 1 (the leftmost cabinet of the APR) has a few lamps \"missing\". For reference the full indicator panel is shown on page 3-3 [here](http://bitsavers.trailing-edge.com/pdf/dec/pdp6/F-67_166instrManVol1_Sep65.pdf)\r\nIf you take the full grid of lamps and remove the ones that are missing in the UWA machine, it doesn't really make sense, so it looks like the lamp positions were different altogether. It seems to be the same machine as this: [1](http://www.computerhistory.org/collections/catalog/102618954) [2](http://www.computerhistory.org/collections/catalog/102680475) [3](http://research.microsoft.com/en-us/um/people/gbell/PDP%20Team.jpg) apparently still standing at DEC at this time.\r\n[This](http://www.alex-reid.com/Personal/PDP-6-Maynard.JPG) photo seems to have the full lamp grid so I'd say it's probably not the UWA machine. In this context it may be noteworthy that the PDP-6 flow diagrams and schematics do not mention the A LONG flip flop at all (set when indexing or indirection happens for an instruction) while the instruction manual vol 1 does describe it. I don't know what to make of this.\r\n\r\n### \\# ~~16~~ 2\r\nSome more photos from ~~Stanford:~~ MIT:\r\nhttp://media.csail.mit.edu/picture.php?/3896/category/173 (are these spacewar controllers in the back?)\r\nhttp://media.csail.mit.edu/picture.php?/3811/category/173\r\nhttp://media.csail.mit.edu/picture.php?/3839/category/173 (not much visible)\r\nhttp://media.csail.mit.edu/picture.php?/3885/category/173\r\n\r\nThe CHM has two front panels (hard to say where they're from...stanford? but why two?):\r\nhttp://www.computerhistory.org/collections/catalog/102732975\r\nhttp://www.computerhistory.org/collections/catalog/102732961\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/PDP-10/-READ--THIS-/issues/comments/272927093","html_url":"https://github.com/PDP-10/-READ--THIS-/issues/5#issuecomment-272927093","issue_url":"https://api.github.com/repos/PDP-10/-READ--THIS-/issues/5","id":272927093,"user":{"login":"aap","id":1521437,"avatar_url":"https://avatars.githubusercontent.com/u/1521437?v=3","gravatar_id":"","url":"https://api.github.com/users/aap","html_url":"https://github.com/aap","followers_url":"https://api.github.com/users/aap/followers","following_url":"https://api.github.com/users/aap/following{/other_user}","gists_url":"https://api.github.com/users/aap/gists{/gist_id}","starred_url":"https://api.github.com/users/aap/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/aap/subscriptions","organizations_url":"https://api.github.com/users/aap/orgs","repos_url":"https://api.github.com/users/aap/repos","events_url":"https://api.github.com/users/aap/events{/privacy}","received_events_url":"https://api.github.com/users/aap/received_events","type":"User","site_admin":false},"created_at":"2017-01-16T17:57:14Z","updated_at":"2017-01-16T17:57:14Z","body":"Maybe this info from Gordon Bell (via email) is of interest too:\r\n> When the KA10 came out, I believe that MIT and Stanford traded in their 6s and we just left them there."}}
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