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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
I'd be pretty sure it was a CS pin issue now, as I managed to get the exact same behaviour with that...
Maybe you could check that Pin 6 on J1 of the WIZnet board can be changed by manually sending values to B2, just to really make sure there isn't some connection issue?
Otherwise I guess after all that it might be possible that your WIZnet board has some problem... Did you ever have it working with any other MCU boards?