Decades ago, my college microwave was an ~800 watt unit that had a large, analog dial, and an actual bell that dinged once (and only once) when it was done. That's it, no other settings. Zero displays, other than the pointer on the dial as it clicked down.
I have one just like it, and the best part is that I just leave the timer wheel set to max, and turn the microwave off by opening doors. I keep the doors just barely open all the time, woth benefit of it starting the moment I close the doors after putting a plate in.
The only button I ever pressed on it is to open doors (mechanical), and once in a while I turn the timer to max (when I notice).
