Announcement

Collapse

Forum Rules and 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.


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.
See more
See less

Sol-20 with Helios II drive

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

    #16
    Yep not a helios boot personality module.

    So now you have to make sure all the "fixes" are done to the motherboard to make it do DMA correctly for the helios and to make sure that the swapped lines on the s100 bus are fixed.

    Cheers,
    Corey

    Comment


      #17
      Hrmm... I thought I posted a reply this morning but I guess I didn't submit. Or I do what I usually do and hit the "Reply to Thread" above this box and to the left by accident.

      Corey, is this documented in the EPT manual as a revision (or two)? Any pointers are much appreciated.

      As an update, I found the vlaues of all the caps that Martin's guide suggests that should be replaced and they're all 1uf. That makes things easy I need to get them ordered and then start the dismantle and checks when those come.

      Thanks.
      Maintainer of http://vintagecomputer.ca

      Comment


        #18
        Not really any pointers to doing the mods, just make sure they are done.

        As for the foam, I bought another package so I had some spare stock at home. It's frost king, L344.

        Comment


          #19
          Quick update: I made my keyboard key pads this past weekend. The weatherstripping I bought was 35 feet long so I got a few pads out of it I had to buy some two sided tape because the weatherstripping was only sticky on one side. I bought the tape from Michael's (arts and crafts store).

          keyboard foam pads.jpg

          I also replaced some caps as suggested in Martin's guide linked in this thread and fired her up. I don't really know what it's supposed to sound like but it seems to be okay. Corey, did you have a video (with audio) on yours? If not, I'd love to see one.

          I am now waiting for the Helios II cards (from Martin himself so I know they work) and am waiting to try it out. Should be any day now.
          Maintainer of http://vintagecomputer.ca

          Comment


            #20
            Wow, that's quite the pad collection you've manufactured!

            Mike

            Comment


              #21
              That looks like enough pads to fix 10 SOL-20's
              retro computing at: www.neoncluster.com ....is dead

              Comment


                #22
                Originally posted by snuci View Post
                I also replaced some caps as suggested in Martin's guide linked in this thread and fired her up. I don't really know what it's supposed to sound like but it seems to be okay. Corey, did you have a video (with audio) on yours? If not, I'd love to see one
                I can take a quick video on the weekend. Remember you will need to make the extenders power cable so that you can align and tune the drive. If you don't get a cable there isn't enough room to work. If you don't do that work you drive may seem to work or not work at all but I can pretty much guarantee and disk you make and use will not be interchangeable.

                Also be careful, if certain cable ends points like the eject switches touch the chassis you will fry the drive.

                Also did you repack the bearings????

                Cheers,
                Corey

                Comment


                  #23
                  Originally posted by Nama View Post
                  That looks like enough pads to fix 10 SOL-20's
                  I have 2 Sol-20s, 2 Apple Lisa's and possibly a TRS-80 Model II that need new pads at the moment. I will use them eventually
                  Maintainer of http://vintagecomputer.ca

                  Comment


                    #24
                    Originally posted by Corey986 View Post
                    I can take a quick video on the weekend. Remember you will need to make the extenders power cable so that you can align and tune the drive. If you don't get a cable there isn't enough room to work. If you don't do that work you drive may seem to work or not work at all but I can pretty much guarantee and disk you make and use will not be interchangeable.

                    Also be careful, if certain cable ends points like the eject switches touch the chassis you will fry the drive.

                    Also did you repack the bearings????

                    Cheers,
                    Corey
                    I have PT DOS disks from two systems plus the factory PT DOS disks so I can check alignment to make sure they all work.

                    As for bearings, I did not repack them. Sometime you just have to leave well enough alone so you don't do any further damage so I'll go this way for now. I do know what the Seagate ST-506 drives sound like so I can tell what bad bearings sound like with those, it's just hard to tell without comparing another. I followed the procedure in the manual to check the spindle bearings and it looks good but knowing the sound is helpful too.

                    I may need some advise on the eject button wires. I removed the front face plate on the drive (for the third time) and ripped the wires off accidentally. Doh! The face plate is so heavy, I didn't even notice. It seems that two of the wires on each eject switch is grounded. When you get a minute to check, is this consistent with yours? If so, which lead does the non-grounded wire go to? I'm assuming the momentarily closed lead.
                    Maintainer of http://vintagecomputer.ca

                    Comment


                      #25
                      I don't recall about the wires. Won't be able to open the drive easily for a few days based upon how it is setup physically I may have pictures, but I'm pretty positive this is something using either the drive or Helios schematics would be easy to determine.

                      Cheers,
                      Corey

                      Comment


                        #26
                        A picture is worth a thousand words...

                        PTDOS SYST.jpg

                        Still have to make sure it's totally fine but she boots! And I was able to fix the eject wires once I fixed a shorted cap. All caps that were recommended were replaced. The drive is almost silent as the fan is louder so I think the bearings are fine.

                        I'm glad I made it this far with Martin Eberhard's patience
                        Maintainer of http://vintagecomputer.ca

                        Comment


                          #27
                          Congratulations. Martin is the best.

                          I guess I should make you a copy of CP/M 1.4 for Helios and send it along. Don't forget to put Martin's xmodem stuff on PTdos. Then we can all send each other programs.

                          PM me with your address.

                          Cheers,
                          Corey

                          Comment


                            #28
                            Great stuff!!!
                            Congrats.
                            retro computing at: www.neoncluster.com ....is dead

                            Comment


                              #29
                              Well done!
                              Torfinn

                              Comment


                                #30
                                Thanks guys.

                                I made a quick video of the internals of the Helios II disk drive verifying a disk for anyone who is interested in the PerSci Model 270 drive mecahnism that the Helios II uses. It's weird that it doesn't just move from track to track but I guess it is better calibrated in the way it checks the disk.



                                Enjoy.
                                Maintainer of http://vintagecomputer.ca

                                Comment

                                Working...
                                X