[jonas21]

> There is also a solenoid inside the enclosure, but since the keyboard is not powered up, this was not being activated — and these are seemingly particularly loud! But why? The teletypewriters, paper terminals and card punches which preceded such early “glass teletypes” would have been very noisy indeed, hence it was decided that terminals like the IBM 3278 would need to provide much more positive feedback than simply that provided by a clicky switch module.

Reading this, I thought it could not possibly be true -- the keys are so loud and clicky already. But it turns out it actually was the case, as demonstrated here:

https://www.youtube.com/watch?v=ZT9CHub9Cxs