Forum Rules and Etiquette

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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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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.
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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

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.
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  • Spelling and grammar are not rated, but they do make a post easier to read.
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Help idetinfing 8 bit MITSUBISHI video card

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    Help idetinfing 8 bit MITSUBISHI video card

    Hi guys got lucky and purchased a brand new NOS XT clone.

    gif site maker

    It have a juko motherboard, but before plugin the video card to a monitor i could like to be sure for what monitor is and how is setup up.
    Searched for info on the web but find nothing, maybe someone knows about the card or jumpers ?.
    The video card says:
    The display chip is DC462312A

    Is there a configuration switch block on the motherboard?? Sometimes the clone boards have the same switch configuration as the IBM boards and SW5&6 might tell you what it is.... maybe. You might also be able to check the pinout for the display connector and see if the RGB lines are connected. Also, the crystal value 16M might indicate that this is a mono card. Interesting find! Do you have a multisync monitor that could work with either color or mono?


      Also noticed the ram chips are 64k x 4bits each, so 128k at 8 bits ?? That might be EGA territory. Hmmm
      Last edited by chris_nh; May 6, 2020, 05:09 PM.


        The motherboard on the computer appears to be dead anyway no mater why y tried can get it to do a single beep.


          Originally posted by soviet9922 View Post
          The motherboard on the computer appears to be dead anyway no mater why y tried can get it to do a single beep.
          Go over it with a multimeter and see if any caps are shorted. A lot of times you'll get lucky and it's just one or a couple shorted tantalums that need to be replaced and then it'll work again


            Based on the evidence, it looks like an EGA clone. You might be able find a specific product name by dumping the ROM. When connected to a compatible monitor, it might also display the product name at boot - Of course, some EGA cards can be set to use an MDA mono monitor, and we don't know what the dip switches do.

            Very nice looking system! Even if the guts are fried, I would say it was worth it. Although I would be a tad surprised if there was anything wrong with the MB other than dirt, lose screw shorting, capacitors, configuration, or bad RAM. (At least you didn't mention any leaky batteries)


              Thanks for the help.

              Pay like a 100 usd for it, the guy that sold this to me have several pallets of systems like this.
              The battery is located on a multi - io card but leaked very little there's some damage on the io but nothing else.
              Inside look 100% clean brand new no dirt or anything is like it got out of the factory.
              For some reason the motherboard is a juko turbo 12mhz i have the manual, but doesn't do anything. Don't see any tantalum caps in it checked and they are no shorts only a very few electrolytic. Removed all the Ram chips and tried several combinations in the banks, but can't get a single beep out of the board.

              Will debug it further today and post some pictures for the motherboard.
              Last edited by soviet9922; May 7, 2020, 11:21 AM.