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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
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  • 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.



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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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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

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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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What is a Corona PPC-400 Worth?

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    What is a Corona PPC-400 Worth?

    Anybody have an idea what one is worth? Working with software, etc.

    #2
    You don't happen to be selling one on ebay? So one that I was watching was going for around $100 working but didn't sell. But depends on the market and what's with the system. Where are you located? That'll also help folks know how much shipping might be or if they're local which would be a better value. I just double checked and the one on ebay that I'm aware of doesn't have any software or manuals so that may be keeping the desire low. Funny I thought they all had the built in printer but I guess that's a different/older model?
    Looking to acquire: IBM 5100, Altair 8800

    Comment


      #3
      Originally posted by ki4swy View Post
      Anybody have an idea what one is worth? Working with software, etc.
      Those are cool. I remember seeing a lot of those around at one time. As for "worth", that depends on the buyer and if they have to pay shipping, which is probably over $100, so not much room left for the price of the unit. Since these don't seem to be as popular as the very similar Compaq portable I guess people would not pay quite as much. The Compaqs are currently gettable at between $25 and $100. If I saw one of these locally (so I didn't have to pay shipping) I'd personally go as high as $50 because it's quite a collectable piece.

      Edit: For those that don't know what these look like, here's a pic.
      WANTED: Cardinal 2450MNP modem.

      Comment


        #4
        Ditto as well Ole Juul, if one was local I'd certainly be interested just as I love to see companies who dabbled in computers but moved out of the market to other niches.
        Looking to acquire: IBM 5100, Altair 8800

        Comment


          #5
          its local, they want 90- im thinking of offering $30

          Comment


            #6
            Ah.. well good for you. $90 with software wouldn't be a bad deal. It's the $90 + $60 to ship that breaks it for most of us But you're certainly welcome to offer what you're comfortable. If they have pics of it working and know the keyboard keys are all good that'll help their sale as well.
            Looking to acquire: IBM 5100, Altair 8800

            Comment


              #7
              Well The last one I had I'd simply give away for free...
              I did not have the original keyboard, but a normal XT keyboard
              worked just fine with a RJ to DIN cable I made.

              Corona PC 1.jpg Corona PC 2.jpg

              Regards, Roland
              WTB: Case for Altair 8800 ...... Rolands Github projects

              Comment


                #8
                Originally posted by Roland Huisman View Post
                Well The last one I had I'd simply give away for free...
                I did not have the original keyboard, but a normal XT keyboard
                worked just fine with a RJ to DIN cable I made.

                [ATTACH=CONFIG]11525[/ATTACH] [ATTACH=CONFIG]11526[/ATTACH]

                Regards, Roland
                This is a really old thread -- but I just bought a Corona PPC-21 and I'm trying to figure out why the keyboard that came with it isn't working. I tried to make an adapter for an XT keyboard, but can't figure out the pinout. I think I found the 5V supply, but when no keyboard is connected, it has just 3.7V output. When I connect the Corona keyboard, it jumps to 5V (4.8V). Not sure which pin carries data and clock. But I cycled through all combinations, but could get none of them to work...
                Let me know if you have any suggestions or if you remember the pinout!
                Thanks!

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