Please take some pictures and document NEC switches on the Deskthority wiki, if you get the chance.
NEC switches are kind of interesting; HaaTa has a couple of NEC boards, and they’re pretty fun/nice to type on. I haven’t ever tried one actually plugged into a computer, but from what I understand, they actuate a bit before the click point, similar to Omron B3G-S or clicky Hi-Tek space invaders, but even more pronounced.