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Our mission ...

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.
  • This is not a chat room. If you are taking less than 30 seconds to make a post then you are probably doing something wrong. A post should be on topic, clear, and contribute something meaningful to the discussion. If people read your posts and feel that their time as been wasted, they will stop reading your posts. Worse yet, they will stop visiting and we'll lose their experience and contributions.
  • Do not bump threads.
  • Do not "necro-post" unless you are following up to a specific person on a specific thread. And even then, that person may have moved on. Just start a new thread for your related topic.
  • 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:
  • "PM Sent!": Do not tell the rest of us that you sent a PM ... the forum software will tell the other person that they have a PM waiting.
  • "How much is shipping to ....": This is a very specific and directed question that is not of interest to anybody else.


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
  • Use Google, books, or other definitive sources. There is a lot of information out there.
  • Don't make people guess at what you are trying to say; we are not mind readers. Be clear and concise.
  • Spelling and grammar are not rated, but they do make a post easier to read.
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Gigantic Logic Board.

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    Gigantic Logic Board.

    I thought it would be worth posting this. I have seen some large logic boards in my time, the original Pong arcade board was pretty big, 60 or more TTL IC;s, then in 1974 Atari (and Kee Games) came out with the arcade Tank game. It had so many TTL IC's they could not fit on the one board at the time, so they broke it up into two boards with a multi-jumper between the two as they could not make a pcb in a single bath big enough for the 150 or so IC's.

    Tonight, I stumbled across a pcb on ebay, some sort of processor for CNC lathe control. It must be "the mother of all logic boards" or computer boards, at a rough count there are about 500 IC's on the pcb ! !

    https://www.ebay.com/itm/23263415149...IAAOSwbP1aX82r

    Imagine fault finding this pcb if an IC failed. You would have to be familiar with the entire design to be efficient at repairing it, it is astonishing. I guess a lot of the packages are memory, but even so.

    #2
    The controller PCB on my Shugart SA4000 hard disk is of similar size; i.e. it matches the disk body outline. Imagine the low yield on boards of this size...
    Reach me: vcfblackhole _at_ protonmail dot com.

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      #3
      Here is the main board from an AED 767 graphics terminal, ca 1980. That was about the biggest board that could be fabbed at the time.
      It just barely fit across our wave soldering machine.

      http://bitsavers.org/pdf/aed/AED_767/AED_767_PCB_T.JPG

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        #4
        Here is the image, in case the ebay ones goes away.
        Attached Files

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          #5
          I hate it when you cant expand the photo for a closer look. My god that board is huge. It must be mostly discreet logic right? Its even bigger (width) than the board in my ADM 3/a terminal

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            #6
            Real engineers use discretes, discreetly.
            Reach me: vcfblackhole _at_ protonmail dot com.

            Comment


              #7
              He send a somewhat better photo. Cool board!
              You do not have permission to view this gallery.
              This gallery has 1 photos.

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                #8
                Hm, the forum shrunk it, let's try as an attachment
                Attached Files

                Comment


                  #9
                  Huh. Just curious, is it showing up as 793x595 for you on those 2?
                  Probably makes sense to limit storage usage
                  I've added a link to the original 1600x1200

                  Edit: ha - ok link not working right either -
                  Try as text: http://westveldgarage.com/images/Big-logic-board.jpg

                  Comment


                    #10
                    You know, this board is so impressive it could be put in a picture frame and hung on a wall. I have seen pictures of bowls of fruit and other much less interesting subject matter that have sold for more $. Maybe give this piece of artwork a name like "IC City"

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