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This forum is part of our mission to promote the preservation of vintage computers through education and outreach. (In real life we also run events and have a museum.) We encourage you to join us, participate, share your knowledge, and enjoy.

This forum has been around in this format for over 15 years. These rules and guidelines help us maintain a healthy and active community, and we moderate the forum to keep things on track. Please familiarize yourself with these rules and guidelines.


Rule 1: Remain civil and respectful

There are several hundred people who actively participate here. People come from all different backgrounds and will have different ways of seeing things. You will not agree with everything you read here. Back-and-forth discussions are fine but do not cross the line into rude or disrespectful behavior.

Conduct yourself as you would at any other place where people come together in person to discuss their hobby. If you wouldn't say something to somebody in person, then you probably should not be writing it here.

This should be obvious but, just in case: profanity, threats, slurs against any group (sexual, racial, gender, etc.) will not be tolerated.


Rule 2: Stay close to the original topic being discussed
  • If you are starting a new thread choose a reasonable sub-forum to start your thread. (If you choose incorrectly don't worry, we can fix that.)
  • If you are responding to a thread, stay on topic - the original poster was trying to achieve something. You can always start a new thread instead of potentially "hijacking" an existing thread.



Rule 3: Contribute something meaningful

To put things in engineering terms, we value a high signal to noise ratio. Coming here should not be a waste of time.
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  • Use the Private Message system for posts that are targeted at a specific person.


Rule 4: "PM Sent!" messages (or, how to use the Private Message system)

This forum has a private message feature that we want people to use for messages that are not of general interest to other members.

In short, if you are going to reply to a thread and that reply is targeted to a specific individual and not of interest to anybody else (either now or in the future) then send a private message instead.

Here are some obvious examples of when you should not reply to a thread and use the PM system instead:
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Why do we have this policy? Sending a "PM Sent!" type message basically wastes everybody else's time by making them having to scroll past a post in a thread that looks to be updated, when the update is not meaningful. And the person you are sending the PM to will be notified by the forum software that they have a message waiting for them. Look up at the top near the right edge where it says 'Notifications' ... if you have a PM waiting, it will tell you there.

Rule 5: Copyright and other legal issues

We are here to discuss vintage computing, so discussing software, books, and other intellectual property that is on-topic is fine. We don't want people using these forums to discuss or enable copyright violations or other things that are against the law; whether you agree with the law or not is irrelevant. Do not use our resources for something that is legally or morally questionable.

Our discussions here generally fall under "fair use." Telling people how to pirate a software title is an example of something that is not allowable here.


Reporting problematic posts

If you see spam, a wildly off-topic post, or something abusive or illegal please report the thread by clicking on the "Report Post" icon. (It looks like an exclamation point in a triangle and it is available under every post.) This send a notification to all of the moderators, so somebody will see it and deal with it.

If you are unsure you may consider sending a private message to a moderator instead.


New user moderation

New users are directly moderated so that we can weed spammers out early. This means that for your first 10 posts you will have some delay before they are seen. We understand this can be disruptive to the flow of conversation and we try to keep up with our new user moderation duties to avoid undue inconvenience. Please do not make duplicate posts, extra posts to bump your post count, or ask the moderators to expedite this process; 10 moderated posts will go by quickly.

New users also have a smaller personal message inbox limit and are rate limited when sending PMs to other users.


Other suggestions
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PDP-11/05 top and side panels drawing

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    PDP-11/05 top and side panels drawing

    Recently I offered to draw up the missing panels for the slimline 11/05 that was on eBay recently. I also received a request from a forum member asking about the measurements so here they are, hope this is useful.
    I could not find an exact match for a single-slot quarter-turn fastener of the right style (McMaster-Carr doesn't seem to have them) but there are some fairly similar from here http://www.southco.com/en-us/81-82-85 except they are cross-slotted.

    PDP-11_05_top_side_panels.jpg PDP-11_05_panels.jpg PDP-11_05_panels_2.jpg PDP-11_05_panels_3.jpg PDP-11_05_panels_4.jpg

    Steve.

    #2
    Originally posted by 1944GPW View Post
    Recently I offered to draw up the missing panels for the slimline 11/05 that was on eBay recently. I also received a request from a forum member asking about the measurements so here they are, hope this is useful.
    Thank you for fulfilling my request Steve :->. Much appreciated!

    [No, I don't have an 11/05, but this chassis was used for other purposes by DEC and I recently acquired (an incomplete) one for use as a 9-slot Unibus Expansion.]

    Comment


      #3
      Paul, no worries. Sorry it took longer than I thought it would. I'm wondering if your 9-slot chassis might be from an LPS-11? There was one on eBay recently, see http://www.ebay.com/itm/DEC-LPS11-La...-/291204838979 It appears to have an a different power supply compared to the 11/05.

      Comment


        #4
        Originally posted by 1944GPW View Post
        Paul, no worries. Sorry it took longer than I thought it would. I'm wondering if your 9-slot chassis might be from an LPS-11? There was one on eBay recently, see http://www.ebay.com/itm/DEC-LPS11-La...-/291204838979 It appears to have an a different power supply compared to the 11/05.
        No, not the LPS-11 (although I wouldn't mind playing with one :->); it was an ME11-L (see: DEC-11-HMELA-A-D in bitsavers) and the power supply is thus appropriate for core memory of that era (+5v 17A, -15v 5A). Fully populated it gets you 24K-words (in 8K-word chunks). The MM11-L designates a single 3-module 8K memory stack (so you could get one to start, add up to two later). You could also get a version that supported 2-bit parity. The ME11-L is listed in configurations for the 11/05, 11/10, 11/15, 11/20, 11/35, and 11/40. Even, surprisingly (to me anyway), in the 11/45. Versatile! Apparently a real workhorse for a while there. And you can see why the 11/05 chassis would have been the chassis to repurpose at the time :->.

        The MF11-U seems to have been the follow-on core technology with greater density (16K stack) but slightly _slower_ performance (900 vs. 1000 ns cycle time; 400 vs 425 ns access time). Interestingly ... smaller/denser isn't also faster. It also uses different power supply rails, so a lot happened in the technology transition. Something to research further ...

        -----
        paul

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