In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Chong wrote:

Power up default of the TRIS reg's are 1 as indicated by my Parallax manual.

I suspect this is a bit of a protection measure so processors don't try to assert or sink a voltage which may result in a damaging current or cause wonky outputs to a signal bus that your processor is connected to.

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