My uncle was so kind to bring me a Model M in an absolutely wonderful condition! It says cleaned in 1996 and seems to not have been used since!
However it came without a cable whatsoever.
It has such port on it's back

Is it just where a PS/2 cable goes in or is it some kind of terminal connector (like my uncle said)? If so, I have read a lot about methods on how to make them work on this forum alone but which one is best?