Anyone have familiarity with anything like these that will work on a Mac in single user mode? In the little experimenting I’ve done, I’ve found nothing that’ll work. Single user mode is pretty picky about what keyboard it’ll accept, even those made by Apple itself depending on the vintage of the computer and the keyboard it’s mated to.
I once tested this with a ATMega32U4, as it can also control the mouse it can as well be a prank tool for eg in the office at work. I made the cursor move in a circle.