Regarding flashing lights, beeps and boop, the nice thing about big mainframes of these days is they really did have flashing lights, and internal speakers that went beep and boop in response to certain CPU activities (program branches mainly, IIRC).
I know , but they never made the noises that are used in films.
Could you imagine a typical Machine Room if they did
My memories are mainly cold (lots of it) and the 'screaming' air con
Also being constantly on guard for the noise of the Halon 'going off', just in case
....... always know which direction the exit door is.
Once had to work in the machine room for a week or two, on some Unix kit which the customer had decided to put in there.
None of it needed that level of Air Con, I suspect it was a quick answer to security. (Entry Door Keycodes in & out)
The mainframe people allowed the 'foreign' intruder in the machine room but refused any connectivity subject to on-going discussions
(AKA Internal Departmental Politics at the Customers site.
)
I therefore had to work in the machine room while 'Discussions' progressed. (Happy Days
)
I know about using the servos on various kit to play music, which was very clever when it worked.
(Not sure it did the servos any good
)