[GreenKeys] Feeding ITTY to the teletype; simulating M33/35 teletypes hooked to computers like in the 70s

[Christian Gauger-Cosgrove]

The RPi is Ethernet only as well... If and only if you ordered a version
with Ethernet. (Which by the way is nought more than a USB Ethernet adapter
hardwired to the board.

Also don't forget the I/O header-pin-thing (why yes, I can English very
goodly) allows you to connect a breadboard to the RPi. But you probably
already knew that.

Cheers,
Christian

On Wednesday, 29 August 2012, Paul Heller <paul0926 at comcast.net> wrote:
>
> On Aug 28, 2012, at 9:35 PM, epvgk at limpoc.com wrote:
>
>> Not sure how much help I can be, but a friend and I wrote some C code
that
>> can successfully decode ITTY audio into binary data using the fast
fourier
>> transform, and also code to decode the binary data into a baudot stream
>> and/or convert it to ascii. You're welcome to that if it will help.
>
> Please send it along, Eric.
>
>
>
>>
>> It seems totally plausible to me. Assuming you can get internet access
>> preconfigured (does it use Wifi? or just ethernet?)
>
> Just ethernet for the Beaglebone. I don't know about the Raspberry Pi yet.
>
>> you should be able to
>> make it work with some variant on my FFT processor and the standard linux
>> utilities. I don't know anything about how you would toggle an output
line
>> from linux in realtime to key the TTY loop, but possibly if the board has
>> a suitably flexible UART you could just send the decoded baudot
characters
>> to that and let it handle it. That would also let you do additional
tricks
>> like have it decode a 45 baud signal from ITTY and output a higher speed
>> signal, or ascii :)
>
> The board does have a UART. Your idea of basing this on your FFT process
is a very good one. Why didn't I see that? So there seem to be some options.
>>
>> Another possibility, if you want to keep it simple, is just set up the PI
>> or beagleboard to stream ITTY over the internet and output audio, and
then
>> depend on an external demodulator to actually decode it and feed the tty
>> loop.
>
> Yes, this would be a simpler faster approach and easier to start with
before progressing deeper
>
> Thanks for your thoughts and suggestions, Eric.
>
> Paul
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