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

AT&T UNIX PC enthusiasts out there?

  • Filter
  • Time
  • Show
Clear All
new posts

    AT&T UNIX PC enthusiasts out there?

    The AT&T UNIX PC aka PC 7300 aka 3b1 is one of my favorite UNIX machines. Any other fans/owners out there?

    Last year I got into playing around with one virtually with Phil Pemberton's FreeBee emulator ( And then I added some enhancements along the way which was a lot of fun learning more about the details of the hardware. Well just recently firebirdta84 hooked me up with some real deal hardware which has been awesome! AJ helped setup David Gesswein's MFM emulator in the machine to get me up and running. There's no floppy so I'm going to see if I can get a gotek working with it, who knows! The UNIX PC FAQ does say that a 720k 3.5" floppy can be supported, but not a 1.44" for some reason. But hoping to just emulate the standard 400k 3b1 floppy.

    I am also lacking a 3b1 mouse so I've been working on a ps2 mouse to 3b1 converter which I've got prototyped. Now trying to figure out a proper hardware design for the converter. That said, does anyone else have the need for a ps2 mouse or keyboard converter for their 3b1? I could probably add keyboard support too if anyone was interested. I know AJ was interested in a mouse converter.

    Anyway, if you have any other fun anecdotes about the AT&T UNIX PC, please share!

    We have a 3b1 and 7300 that were my wife's when they were a cheap way to get a UNIX computer. Its been to VCF east a couple times. Last was I have an image I made for VCF museum if you want to play with it. Freebee also has an image.

    My wife's porting of dungeon may be a fun anecdote.


      Haha, I just happened to come across that picture yesterday of your wife with the 3b1 at VCF East -- I thought that was really cool. I'm in fact using your VCF image right now on your MFM emulator (that AJ built), and I also use that image with FreeBee! Thanks so much for putting it together. It's come in handy for me, and also is a great resource for anyone who wants to try out FreeBee. When I first played around with FreeBee, you needed to do the full OS install and there is an emulator glitch where the install process can hang when it gets to "setting up screen".

      I'll have to check out that story of the dungeon port.


        I have three, so you could say I'm in to them. Along the way I accumulated an expansion memory board, PC emulation board (8086), expansion chassis, tape drive and one serious unicorn: the ethernet adapter. Very cool machines with classic styling.


          Originally posted by shirsch View Post
          Along the way I accumulated an expansion memory board, PC emulation board (8086), expansion chassis, tape drive and one serious unicorn: the ethernet adapter. Very cool machines with classic styling.
          Ahh yes, the fabled Ethernet card! I would love to get my hands on one of them some day. I hear the TCP/IP stack isn't great but it's gotta be better than not having one. I have heard of a number of people with the DOS card, I wouldn't have guessed that would have been as popular as it seems it may have been. And the expansion chassis, wow -- I have read of it but never saw one or even a pic of one. It's impressive they even made such a thing. I would have guessed 3 slots would have been sufficient. I hope to get a RAM card some day too, but I've got 1MB for now.


            Today I used the serial port and a null modem cable to xmodem (“umodem -rb”) over a file, fortunately worked without an issue. That file was an interesting one which was the vidpal emulator. It’s a driver that lets you write directly to VRAM. Easy to compile and install and seemed to work. I’m interested in being able to write to VRAM as it’s straightforward and I don’t have to learn the “proper” way you’d otherwise do it. There’s overhead for sure but don’t think I want to mess with a hardware workaround at this point like the original Vidpal mod. Anyway if you are interested the vidpal emulator is here: