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.
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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
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  • Spelling and grammar are not rated, but they do make a post easier to read.
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EtherJet ISA 16-bit on a PS/2 model 25?

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    EtherJet ISA 16-bit on a PS/2 model 25?

    Hey Folks,

    I was just curious if a 16-bit IBM EtherJet card would work in a PS/2 model 25 (which is only 8-bit ISA of course):

    I guess I could always try it out, but the model 25 is stowed away until I get room to set it up. Also awaiting a SB 2.0 for it -- found a cheap one for $40.

    if its anything like the very similar 3com version... then no. I had to buy a parallel <> ethernet for my M25.
    It is a mistake to think you can solve any major problems just with potatoes.


      Originally posted by luckybob View Post
      if its anything like the very similar 3com version... then no. I had to buy a parallel <> ethernet for my M25.
      While they may look slightly visually similar, the etherjet cards don't use any 3com chips. But it's good to know that the etherlink IIIs are 16-bit only.
      Guess I'll just give it a shot and find out later

      I have a feeling it'll be 16-bit only as well-- just given how many traces on the 16-bit extension are going back to the IBM etherjet chip.


        If it was just the Irq lines then usually it will work 8-bit so long as you use 8-bit setup. That said, give it a try. I can't imagine it will hurt anything.
        It is a mistake to think you can solve any major problems just with potatoes.


          The manual for some other IBM 16-bit Ethernet cards is [here].
          There may be some information in that manual that also applies to your card (see appendix B).


            I believe that the Etherjet ISA cards use either the Crystal CS8900 or CS8920 chips. That being the case, your answer is probably "no". These chips start off with a 16-bit interface. While it's possible to do 8 bit DMA transfers to them, data must be aligned to a word boundary. Nothing in the datasheets about doing programmed I/O in 8 bit bytes.

            There's a ton of information in the CS8900 and CS8920 datasheets (each runs to about 120 pages and even has PCB layouts and component lists).
            Reach me: vcfblackhole _at_ protonmail dot com.


              I would get the utilities loaded and just try it out. Other variants of the IBM Etherjet cards advertise compatibility with 8 bit ISA.