If you're interested:
http://stackoverflow.com/questions/8632586/macos-whats-the-difference-between-dev-tty-and-dev-cu
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
If you're interested:
http://stackoverflow.com/questions/8632586/macos-whats-the-difference-between-dev-tty-and-dev-cu