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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.
@JumJum
@Wilberforce, 0x100000 is start of save area, which is 16 pages, each 4096 bytes.
So startadresse is end of flash area (0x110000) minus size of your empty file.