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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.
@DrAzzy
That should work - though I'm not sure it'll be necessary to put the scripts onto the SD card, I can certainly see the utility of this.
No matter what, though, you should load the files onto the SD card using an SD card reader, and then put into the Espruino.
Using the Espruino, instead of a SD card reader (which can be had for about the cost of a latte, even in a brick-and-mortar store) to fill the SD card with static files from your computer would be a case study in how to make life hard on yourself. You can of course have your code write to the SD card, and send it code to write the files, but this is an awkward way to do it.
Regarding the original question - it should definitely support cards up to 32GB (the limit of the SDHC standard) if it supports cards larger than 4GB (the limit of normal SD), and I think as long as it's formatted FAT32, you should be able to go higher. Note that (as Gordon has said numerous times), Espruino only supports FAT32. Windows insists on formatting cards above 32GB (and such cards are typically preformatted) in exFAT, which presumably won't work. Google can tell you how to format them as FAT32 - there's oodles of information on this because some cellphones insist on FAT32 as well.