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

A New V2 FPGA S100 Bus Board

  • Filter
  • Time
  • Show
Clear All
new posts

    A New V2 FPGA S100 Bus Board

    Some of our regular members may have noticed that I have not added a new S100 board to our list in a while. This is because I have been sinking quite a bit of time into this new board which I am now announcing. It took a lot of time/effort. It is called the V2 S100 Bus FPGA Board. It is an extension of our earlier "V1" Board. It is described here:-

    This board contains essentially all the circuits and functionality of the V1 board but now has the FPGA output pins arranged into four 16X2 0.1" sockets so that various "FPGA Shield boards" can be added. Much like the Arduino Shield boards concept. These ~ 4"X4.5" two layer boards can be easily and cheaply made by any PCB manufacturing house. This will allow you to add any functionality you like to the S100 bus easily and cheaply.

    By way of illustration I will make available a single FPGA shields board that contains

    A UART Serial port
    A VGA Pong Game Demo
    A PS/2 keyboard port
    A two line LCD display
    A SPI driven Digital to Analog Voltage Potentiometer
    A I2C 24C512 EEPROM

    All these are available and are driven (together) by the onboard Cyclone IV FPGA.
    There is still a patch area on the board!

    As for the original V1 FPGA board that FPGA can act as an S100 bus master or slave and can monitor/change almost any S100 bus line.

    On top of this I have added on this V2 board the equivalent of an Arduino UNO circuit with its own Arduino shields sockets. This is modeled after our MEGA 328-2560 S100 board. Pins from the ATMEL 328 CPU are also brought out to the FPGA Shield sockets so the 328 CPU can interface with the Cyclone IV if needed on the FPGA Shield board. Lastly both the FPGA and 328 CPU share pins with an SD Card adaptor so data can be read/stored.

    With this board and our now large portfolio of previous S100 boards encompositing CPUs such as a 6502, 8080, Z80, 68000, 68030, 80386 and 80486, RAM boards from 1MB to 32MB and video boards like our VGA board, our MSDOS Support board and our IDE/CF card board, the sky should be the limit as to what you can do on the S100 bus.

    I would really like to impress upon our members to give using and programming FPGA's a try. The Intel programming IDE "Quartus Prime Light" V18 is free. While it takes a little patience to program your first few circuits, once you do so you will not look back.

    While I have you...
    I now plan to make a major push to bring the Internet to our S100 bus systems. Again using an FPGA shield. BTW, the one gaping board we are missing is a GB+ capacity DRAM S100 board. One or two have tried to tackle this issue, perhaps an FPGA might be an approach.

    As always this V2 FPGA board is now open for our members to request a bare board or two. I will also do a group purchase of the illustrated FPGA Shields board which I will call a FPGA Shield #1 board. I also made an empty FPAG Shield #0 board with just a large 0.1" patch area and the shields sockets. If there is interest I can order a batch of these as well. However I would really encourage you to think of doing your own FPGA shields. The KiCAD/Gerber files are available at the bottom of the above page.

    Please order the V2 FPGA Board, Shield #1 and Shield #0 boards by responding here:-!forum/s100computers

    Most members know the drill. The bare boards will take about 1 month to arrive. V2 board is a 4 layer board with gold fingers and will cost about $32/board. The shields will probably run between $12-$16 per board depending on demand. Payment will be via PayPal after you receive your board(s). I have all regular members shipping address. New members contact me directly.

    John Monahan
    Last edited by monahan_z; February 23, 2019, 09:44 PM.

    Cannot seem to get the (long) URL link to work in this post. It should be:-


      Feb 24th and not a single reply! If i had the skills requited to know what to do with the FPGA board, I'd buy one! I have the S100 computer, im far from being a programmer however.


        Actually lots of replies on the S100 Forum!forum/s100computers


          So I have seen - just thought someone would comment here.