a 9 pin connection

[askingstuff712]

what is this called on the back of my desktop tower? and what goes in it?

 

[kanewolf]

A serial port looks like this

It is a nine pin connection

 

[Dark Lord of Tech]

https://en.wikipedia.org/wiki/Serial_port
Serial Port
http://www.hobbytronics.co.uk/tutorials-code/tutorials-misc/pinout-9-dsub-serial

 

[askingstuff712]

a serial port? what connects to it? or is this an old port from around the days of the old longer printer port? i have that too on this pc.

 

[Quixit]

a serial port? what connects to it? or is this an old port from around the days of the old longer printer port? i have that too on this pc.

It's even older and slower than the LPT port you're referring to. It was replaced by USB 20 years ago.