Pycom Documentation Bible
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https://www.verical.com/datasheet/pycom-rf-wireless-development-tools-universal-oem-reference-board-5724195.pdf
FYI, I ran across this document posted on the Arrow Web site to support its Pycom inventory. that I have not seen before (all Pycom info in a single document) which is about 500 pages. I have no idea how old it is but it looks newer than some of the official content. I prefer to have a document that I can work from and scribble on. If it helps someone else the link is posted above. In the states, Arrow has pretty good inventory and decent shipping,