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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.
@Gordon
It seems to work for me on 1v54. Are you using the Espruino board, or one of the other boards?
Some boards (like the F4 discovery) don't have flow control on USB and so can lose characters as they are sent.