datajerk · HackerTrans

https://bluehorizon.network is an implementation of open-horizon. If you want your own instance of open-horizon reach out to us on the bluehorizon.network forum. Right now we have limited docs on how to standup your own. It's also not trivial (you'll need to build your own data ingest, poc apps, blockchain, etc...).

datajerk

15 lat temudiscuss

Yes. Visit http://asciiexpress.net/diskserver. That is exactly what it does. It's in beta now. I plan to have 1000s of disk images soon.

datajerk

15 lat temudiscuss

I boosted the volume of the sound files from 50% to 75%, that should hopefully solve your problem (others have it too). Check in an hour or two for v0.5 to be up with the new audio files.

Thanks again for testing.

datajerk

15 lat temudiscuss

Excellent. Thanks. I added your video to the README page. Bummer HIFI didn't work for you. Try again with max volume or a different computer. It's not your Apple II.

datajerk

15 lat temudiscuss

Yes, noise corrupts the bits.

"the most common cause of error is external sounds being piped into the download stream (e.g. mail alerts) and low volume" -- http://asciiexpress.net/gameserver/readme.html

There are many ways to transfer info via audio (e.g. google for modem or frequency-shift keying). The Apple Game (and Disk) Server does not use FSK however. It relies on the Apple II cassette port which is nothing more than a 1-bit digital-analog-converter. IOW, it can detect the shift from positive to negative (zero crossing). The game server WAV files encode the game @ 48K samples/second using a single 12kHz wave for the zeros and a single 8kHz wave for the ones. IOW, 4 pulses for 12kHz (2 +, 2-) and 6 pulses for the 8kHz. The Apple II has a 1023000 cycles/second clock. So I have to detect the zero crossing, chksum and write the data in 1023000/12000 ~= 85 clock cycles. As long as the audio stream is clean and perfect (something only a computer or CD player can do), then it works every time.

If you load up any of the games in Audacity (freeware waveform editor), you can actually "see" the 0's and 1's. The 0's will be thinner.

Lastly, I will be publishing an article on my blog (http://jerkwerks.com) this month with how it works and all the source code.

datajerk

15 lat temudiscuss

Sorry guys. The Apple Game Server can only stream single binary RAM-only games. Disk-based games can be streamed to disk at http://asciiexpress.net/diskserver. I added Oregon Trail.

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