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@KurtE thank you for the information!!!! I will have to do some simple code to experiment with the info to get a better understanding. Just to be clear, it appears that you are equating Port4 for GPIO4 - I didn't see Ports per say defined in the...

I am not sure there is everything you mentioned all in one place, but for example what pins do you what: If you look at thteT4.1 product page: https://www.pjrc.com/store/teensy41.html You will see it showing the card, and then a link to a...

I am sorry to bother the forum members, but I have literally spent hours searching the website and forums, and have come up empty. I am using Teensy 4.1. I have successfully installed Teensy into Arduino IDE (which I have used for several...