Announcement

Collapse

Forum etiquette

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.


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.


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.



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.


"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.

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.
See more
See less

SOL-20 Repair and Restoration stump at troubleshooting

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    SOL-20 Repair and Restoration stump at troubleshooting

    Well I received this cool sol-20 computer that I am trying to restore. It was working when I received the computer and needed to replace the pads on the keyboard. I also replaced a hex inverter on the keyboard. However all I get is a blinking cursor and no keyboard response except for the three keys that have lights on them (local, shift, caps). Does anyone have any guess to where to start looking also what format is the data on the keyboard is this something I can interface the arduino to and create ASCII characters and see if its the keyboard or something else? I have a youtube video of my issue https://youtu.be/iE1HaG-F2mQ

    #2
    Hi,

    I have done an article on how aspects the SOL-2 keyboard functions and made a keyboard diagnostic tool, you could make an Arduino version of it, or just check initially if the keyboard is generating the correct output codes at its output connector. The diagnostic tool and details of the signals starts on page 19:

    http://worldphaco.com/uploads/HARDWA...OR_THE_SOL.pdf

    Hugo.

    Comment


      #3
      Originally posted by Hugo Holden View Post
      Hi,

      I have done an article on how aspects the SOL-2 keyboard functions and made a keyboard diagnostic tool ...

      Hugo.
      Thank you for preparing this document. Excellent work. I have a non-SOL capacitive keyboard that I'm currently investigating; your diagnostic tool looks like something that I'm going to adapt for my own purposes :-}.

      Comment


        #4
        Thanks, you are welcome.

        The codes generated are well documented in the SOL manual. There are also 4 lines that need checking /RST, /LOCAL, /BREAK and /STROBE, specifically worth checking that the /STROBE output pulse (its a narrow pulse) is present to alert the computer the output state is stable & ready. One helpful part of the keyboard design is that the output code(or character) from any key remains stable on the output after the key press so its easy to press a key and take as much time as you need to check for the correct output on lines B0 to B7.

        As noted the /RST (computer reset) is generated by the Sol keyboard pressing the upper case and repeat keys together.

        Comment


          #5
          You will find that the link to the article I posted above has now stopped working. I was forced to re-create my website and the old URL's don't work (for now at lest) but if you go to the worldphaco.com website and hunt through the articles, you will find the one about the SOL-20 keyboard.


          ...the broken URL problem is now fixed.
          Last edited by Hugo Holden; May 24, 2021, 04:43 PM.

          Comment

          Working...
          X