Makes much sense that it would be the low 1.8V level. I think I will go the cautious way and get the FTDI cable - TTL-232RG-VREG1V8-WE - rather than fiddle with dropping resistors and such. Everything is going to low voltage, I'll probably be needing it again for something.
I will leave the description standard setting to those who did the research, but I agree that right now it is confusing to sort out the various access methods just for the K3, not to mention the further complication of the dx models.
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