They're still cheap enough to find (if you don't go IBM Model M for the keyboard) and work well enough. I actually have a PS/2 to AT keyboard converter like Puck was talking about. Works really nicely. Unfortunately my nice PS/2 keyboard with switches has some dead keys on it so it's not being used ... more
Iirc, they started appearing on 486's. You'd need an ISA USB card otherwise.
Funny, though, I've got tons of PS/2 keyboards and only a few USB keyboards. Most computer manufacturers included PS/2 keyboards in the box for a long time after USB became standard. You can get adapters, though. You w... more