Um, a PS/2 is a computer. IBM used to make them; they were 386s and 486s and had some inovative designs. That is where we get the PS/2 keyboard and mouse connectors from, as well as several other features that made it into modern motherboards, though their quick swap drives that were as tall as a 5¼" drive and a wide as a 3½" drive never really caught on.

Next time someone calls a PlayStation 2 a PS/2, I'm gonna scream
--WetWired