Many ultranets have been "constructed" using the Axiom of Choice. Presumably those are not "constructions" in your sense. There are models of ZF without any nonprincipal ultrafilters - see ams. By "constructed" I mean although I don't how to express it completely formal a way that gives more insight than just the knowledge of its existence. The same as in Willard: "Explicit constructions of free ultrafilters have never been acomplished" Correct me if I'm wrong: according to that paper there is no hope on finding such a construction only with ZF, as it is consistent that no non-trivial ultrafilter exists at all.
Upon reading the question, I myself searched briefly for such a result but didn't find it. Perhaps you should leave this as an actual answer? Add a comment. Active Oldest Votes. Improve this answer. Dorais Sign up or log in Sign up using Google. Have you looked for patents or patent applications?
Are there protocols with similar purpose that you can read about? The human eye and brain are remarkably good at pattern recognition, so a useful first step is to convert the signal of interest to a visual representation.
For a wired 2-wire connection, I would usually start by using a simple multimeter across the line. That gives some rough indication of what voltages might be present. That's important for both personal safety and the safety of any other equipment you might attach. So the next step I'd use would be to attach an oscilloscope. The simplest and most typical 'scope setup is simply a graph of voltage over time.
This can give a lot of insight. For instance, are there discrete voltage levels used? If so, how many 2, 4, more? Does the signal appear to be packetized or is it more or less continuous? What is the shortest duration between changes in the signal?
If you have equipment that you can control, try changing just one thing to see how it affects the output signal. For example, try sending a 1kHz sine wave audio signal over a single channel. Now send the same signal over 2 channels. Try changing the audio frequency. Try changing the audio amplitude. All of these can lead you to some insight about the protocol. If you can faithfully digitize the signal and store it as a file in your computer, then you have many many more resources available to you for investigation.
You can do the spectrum analysis on your computer. You can try out theories about modulation type, channelization, and so forth all on the computer by using off-the-shelf or your own custom software. This is the fun part for most of us!
If you think you have figured out the protocol and if you have either equipment you can control or at least more samples you can observe, then test your theory with that data. See if your computer implementation of the protocol matches what you observe. Ideally, you'd also be able to build your own interface and pretend to be one end or the other of the protocol. In the case of audio gear, you're not likely to hurt anything if you're not quite correct.
Other realms such as vehicle engine controls may very well require much more caution. See if you can test corner cases and error conditions. If you can, and if it's responsible to do so, consider sharing your results. Chances are that somebody out there somewhere also has the same interest. By sharing notes, you'll both make more progress than if either works in isolation.
Many's the time that I've had great luck finding even a half-baked partial implementation on github or sourceforge or the like, saving me a ton of time. I try to share what I've found, too, in the same spirit. Sign up to join this community. The best answers are voted up and rise to the top.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How do I work out the Ultranet protocol? Ask Question. Asked 6 years, 4 months ago. Active 3 months ago.
Viewed 24k times. Greatness dies in the dark, it is my hope that releasing something will show the dream is true. Please, if you can assist in any way to see this project grow, contact me. Member Posts: This is awesome! I want one so I can make some stuff for it.
Hybrid Divide Jr. Member Posts: 9. This is amazing, and I really, really wish I knew how to assist somehow! Hope you'll succeed in making the final version into a cartridge adapter for Super NT support! Best of luck!! Has anyone tried it that can report how it worked for them? Very interested how compatibility is, since it's only ever ran on my dev system.
I could test out f-zero.
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