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    I found these forum references:

    'There are definitely pins you can't touch because they're used for the flash chip (the 6 pins at bottom of the esp12E modules)'


    'These are used by the internal flash chip - you will have issues if you use these pins!'

    and they both agree with L409-L413 in the jshardware.c assert source note.

    So it appears for this particular board, that the prefix 'NodeMCU' must be used for the pin assignments.

    More for tomorrow, take a fresh look at all the 'D' references and compare with the pin images.


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