A fun fact: IBM OS/370 never made sounds, but it was the terminals that did! You would expect to hear a horrible screeching sound every time you press Return or

A fun fact: IBM OS/370 never made sounds, but it was the terminals that did! You would expect to hear a horrible screeching sound every time you press Return or a function key - that's how you would know that you got a response from the system and the screen was updated (which could take a few seconds).