I like to joke about what sort of idiot designs a round connector that is keyed, the worst of both worlds. Now, a round keyed connector is not necessarily a bad thing, the round shell can be very strong, but the ps/2 mini-din went too far. the shell was too small and the key not assertive enough. It was a bad connector.<p>The worst I have seen was an old ati all-in-wonder I had where the video input ports were on a dongle with a ps/2-like minidin but high density, with about 10 pins. It only took two insertion operations before I resolved to do everything in my power to never unplug it again. getting all those thin pins aligned was basically impossible.<p>I actually had to fact-check myself because I remember that infernal connector having about 20 or 30 pins, But I looked it up and it "only" had 10.