I have looked all over for documentation of what I/O pins are UNUSED on the Einsy Rambo board so that I could use them for my project, but have come across no DEFINITIVE documentation.

I DID come across a document which seems to show all the pins on the CPU of the Einsy Rambo board with quite a few of the I/O pins not attributed to any use, the ones with the corresponding "Function" field left blank.

I've attached that document to this posting.

Can anyone tell me if indeed those un-attributed pins are indeed available for use for other purposes, like controlling the additional hardware for my project? And whether or not I should be able to use the M62 and M63 GCode commands on them?