[GreenKeys] Model 33 online

[Hugh Pyle]

Hi everyone,

My model 33 (thanks to Wayne's refurb expertise) is now working great, and
I connected it to the Internet to play.

This involved building a loop-to-USB adapter with a small amount of
electronics and a Teensy 3.0 microcontroller.  I have a box full of Teensys
waiting for projects, so this was an easy choice, although it turns out
that their hardware serial UARTs is driven by a clock divider that can't go
as slow as 110 baud.  So the serial interface is done in software.

I had the teensy do some case conversion and CR/LF delays and a few other
things to make it easier to deal with on the linux side.

Some project notes and schematics here (showing off my very-amateur
electronics skills)
http://cabezal.com/pix/tty/tty-usb.pdf

Having the loop interface was working, next piece of fun is actually
logging in to computers with the terminal.  First OSX,
https://github.com/hughpyle/ASR33/tree/master/osx
then a Raspberry Pi,
https://github.com/hughpyle/ASR33/tree/master/rpi
The RPi is on wifi, which makes it a really nice selfcontained system.  I
think it'll live in the base long-term.

Also in that github repo some of the commandline tools I'm starting to play
with.  Inspired by Eric Volpe's software collection but nowhere near as
versatile yet.  First off is just printing words on tape.
http://cabezal.com/pix/tty/pix/20180926_211416.jpg


This is a lot of fun.


- Hugh
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