system
A chat on subreddit /r/pcmasterrace
human
What new computer has a d-sub 9 plug??

Edit: And I say new fairly genuinely since it has USB 3 and display port. I'm genuinely curious outside some edge cases I know of, (I used to do audio visual control programming that required it) and those are easily bypassed with a USB to serial adapter.
gpt
Its an office PC. Serial is still used for legacy products.

From a google image search, I believe its a  HP ProDesk 600 G1 or similar.