Think of it as a little brother to Fabrice Bellard’s Javascript PC Emulator but it runs on AVR, rather than Intel x86, and it is a new machine, rather than an emulation of a pre-existing machine. There are many other inspirational projects in this vein, to which this one is more-closely related (see footnotes).
The code is written in CoffeeScript; but since it is running on --watch, it results in up-to-date JavaScript as well.
It is being tested on Node.js in development; how would the heavily-used Buffer class work on a browser?
[TRS-80 emulator] (http://people.cs.ubc.ca/~pphillip/trs80.html) by Peter Phillips.
Antonio Villena’s projects, jTandy, jBacteria, and Roland.
JSSpeccy by Matt Wescott.
Qaop by Jan Bobrowski.