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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
@Manxome - thanks, I'll take a look at it (I'm a bit busy this week though!).
The F401 binary is very new, and while it uses the same processor as the Pico it keeps the time a bit differently. It could well be that something has got set up wrong in the processor, and so the timings are all off.