I retired from teaching this year (2020) after thirty years in High school.
From that first year in 1989, I saw the projector morph briefly into a gi. (I can still smell that warm ink!) The coolest technology I used was a reel-to-reel movie projector and a filmstrip projector that advanced by itself instead of giving me the beep to advance it.
When I started teaching, we still typed everything on electric typewriters and then had someone in the office run copies on a mimeograph machine.
I retired from teaching this year (2020) after thirty years in High school