What is the 15-pin black port that old sound cards have? Here is an example 
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2It's probably a game port.. The specifications of the card would help determine what it is exactly.– RamhoundCommented Aug 7, 2020 at 22:16
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@Ramhound Wonder why they got rid of it nowdays...– Stelios LiakopoulosCommented Aug 7, 2020 at 22:22
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2@ΣτελιοςΛιακοπουλος "Wonder why they got rid of it nowdays" -- The original device ports on PCs such as COM, LPT, and game ports as well as ISA were abandoned because they were not self-identifying to software (i.e. the OS) (and required manual configuration), when the trend was for plug-n-play hardware to make PCs easier to use.– sawdustCommented Aug 7, 2020 at 23:18
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2 Answers
It's a game port (as Ramhound points out correctly). Used to connect a MIDI device (like a keyboard) or joysticks before USB was introduced.
Edit (added from comments): It was originally located on a dedicated expansion card and later integrated into sound cards (like the Sound Blaster card you are showing on your picture).
This is a game port.
It was originally designed by IBM to support arcade-style analog joystick controllers, but was later extended by Creative Labs (the company behind Sound Blaster) to additionally support MIDI devices such as synthesizers through an adapter.
A single game port supports two joysticks, each with two analog axes, and a total of four digital buttons.
USB would later replace the game port for both of these applications. Needless to say, USB is now used for myriad other purposes, from keyboards and mice to storage devices and battery charging.
