OPTA does not need "pinMode?"

Official Hardware Opta
1

I made a search for this and came up empty, so gonna toss it out there...

Almost every example/sketch I have seen for the OPTA shows pinMode(.,.) being used. I was debugging a sketch today and realized I had forgotten to use pinMode for one of my inputs. I discovered that was not the problem, as the pin next to it was also NOT setup in pinMode, but it DID work as programmed. After I fixed a hardware problem, I tried "commenting-out" ALL my pinModes to see what would happen.

Surprisingly, the sketch ran perfectly with NONE of the analogInputs, LEDoutputs or relayOutputs being assigned ANY pinMode.

Why is this? (or am I nuts?)

2

I don't know about the OPTA, but when using Arduino boards such as the Uno pins default to INPUT and analogue pins do not need a pinMode() in any case because it only relates to digital pins