Somewhere between RCA and HDMI connections, there was S-Video. It was mostly used from the mid '90s to the early 2000s in pro video applications, because it separated brightness and color onto two separate channels.
Sitting next to it is a parallel port, mostly used for printers before those all went USB, and today, wireless.
We're finally saying goodbye to ExpressCard slots on most laptops, and the PCMCIA is another remnant of an era gone by. Devices ranging from external storage to modems and network cards used the slot.
We hear that modem ports are still useful for business travel to remote parts of the world, but right now we're getting along just fine with Ethernet and Wi-Fi. That's one port we probably don't need, unless we're time traveling.