I was eleven in '75 and started with computers in a very similar way, except ours was on a table in the corner of the room. No acoustic couplers.
I think it was a DG Nova, or Nova 2, and every time it crashed (often) it had to be re-booted using a front panel switch sequence. We had 3 tty terminals (that had built in paper tape punch/readers) and... a VDU!!! OMG we used to fight over using the VDU.. I still have tinnitus from those tty's.