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

GW-12887-1: A DS1287/DS12887 et al. Replacement

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

    #16
    Want!!! [ATTACH=CONFIG]42789[/ATTACH]
    My Vintage computer/blog site
    Searching for a keyboard for a WYSEpc WY-1100.

    Comment


      #17
      Originally posted by gslick View Post
      Anyone know for certain if these would work as a DS1287 replacement in a VAXstation 3100 M76?
      Code:
      KA43-A  V1.2
      
      F...E...D...C...B...A_..9...8...7...6...5...4...3_..2_..1?..
      
      
       ?  C  0080  0000.4001
       ?  6  80A1  0000.4001
      ??  1  00C0  0011.700C
      
      >>>
      Well, that yak shave is done! Ended up getting NetBSD going just so I could set the time Seems the M76 is different enough from the early revisions that my MV3100 disk with ULTRIX wouldn't boot. But yes, it does seem to work -- keeps time, D and E errors (NVRAM, RTC) gone after setting the time.
      Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

      Comment


        #18
        What is the purpose of the crystal next to the battery holder? Doesn't the motherboard typically provide a clock signal?
        My Retro Computing and Vintage Gaming Blog : http://nerdlypleasures.blogspot.com/

        Comment


          #19
          I think this is great! about time someone came up with a solution/replacement.

          Comment


            #20
            Originally posted by Great Hierophant View Post
            What is the purpose of the crystal next to the battery holder? Doesn't the motherboard typically provide a clock signal?
            It's a 32.768 KHz clock source for the RTC. If the clock module relied on a clock from the motherboard, the clock would stop when you powered the machine off, so, it has its own local low-power oscillator.
            Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

            Comment


              #21
              Originally posted by VERAULT View Post
              I think this is great! about time someone came up with a solution/replacement.
              Thanks! I like it a lot better than paying Maxim for an expensive module that a) may not work in the original circuit anyway and b) will still die in around 10 years. Much nicer to be able to just change the CR1225 cell!
              Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

              Comment


                #22
                Originally posted by glitch View Post
                Thanks! I like it a lot better than paying Maxim for an expensive module that a) may not work in the original circuit anyway and b) will still die in around 10 years. Much nicer to be able to just change the CR1225 cell!
                speaking of which why did you go with the CR1225 over the CR2032?

                Comment


                  #23
                  Originally posted by VERAULT View Post
                  speaking of which why did you go with the CR1225 over the CR2032?
                  It fits in the outline of the module. More important in the GW-48T02-1 and such since those are often down in a carrier (e.g. in Sun systems), but I do have some systems with devices very close to the RTC module where a CR2032 in a holder wouldn't fit. I did a lot of measuring to settle on the largest standard coin cell I could get in there.

                  There's also a height restriction on some systems (some of the PS/2s, many of the Sun systems). The CR1225 was the best overall solution, and I'd rather only have to buy one kind of battery holder. It's also the cell that was present in several of the different kinds of modules I disassembled for the design phase of this project, so it should provide comparable life to a factory module, discounting of course cheap cells with poor seals (I think it's Mostek that claimed a 50% increase in cell life due to the potting compound making up for poor cell seals). To avoid the problem, I just order high-quality brand new Renata cells They're $0.85 each in QTY 1 from Mouser.
                  Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

                  Comment


                    #24
                    Originally posted by glitch View Post
                    It fits in the outline of the module. More important in the GW-48T02-1 and such since those are often down in a carrier (e.g. in Sun systems), but I do have some systems with devices very close to the RTC module where a CR2032 in a holder wouldn't fit. I did a lot of measuring to settle on the largest standard coin cell I could get in there.

                    There's also a height restriction on some systems (some of the PS/2s, many of the Sun systems). The CR1225 was the best overall solution, and I'd rather only have to buy one kind of battery holder. It's also the cell that was present in several of the different kinds of modules I disassembled for the design phase of this project, so it should provide comparable life to a factory module, discounting of course cheap cells with poor seals (I think it's Mostek that claimed a 50% increase in cell life due to the potting compound making up for poor cell seals). To avoid the problem, I just order high-quality brand new Renata cells They're $0.85 each in QTY 1 from Mouser.
                    Makes Sense, thanks for letting me know.

                    Comment

                    Working...
                    X