I worked for a large financial institution as a mainframe operator and we had a warehouse/archive full of millions of "job control stacks"-trays of those punch cards that were used to run the applications on the mainframe. Dropping a tray or shuffling the cards was instant termination!
Here is something from my early years of teaching that was some high tech then and now no one hardly uses.
1. Everyone in the building wanted one and I think Avery was a popular company that sold them.
2. Although it was cool, it still caused some children to say " I can't see".
3. If you didn't have a computer in the room or access to a television, you didn't care to have one.
I chuckled a bit when you said there was chime from the cassette player, cassette players are a step-up from what I remember. I remember when record players were used for film strip narration. (And, I remember how special it was to be picked by the teacher to work the film strip projector for the class.)