What is this?

Solution
That black port looks like a parallel port (https://en.wikipedia.org/wiki/Parallel_port). They used to be used for printers, and still have some usability if you have a printer that isn't working via wifi or USB, and has a parallel port.

edit: looks like they're both parallel ports, just different versions
That black port looks like a parallel port (https://en.wikipedia.org/wiki/Parallel_port). They used to be used for printers, and still have some usability if you have a printer that isn't working via wifi or USB, and has a parallel port.

edit: looks like they're both parallel ports, just different versions
 
Solution