If you have a Mac that:
#1) Has an ADB port (Blue and White G3 and older)
and
#2) Can run OSX
Then you can use this keyboard with it in OSX
And I dunno what this bullocks is about it not being a regular ADB keyboard because I grew up with this keyboard plugged into our Macintosh Centris 650. It certainly doesn't plug into the serial port, I can guarentee you that.
The fact that I've never seen or heard of another ADB NeXT keyboard makes this such an interesting piece of hardware. I'll try to get a pic of the ports.
Still have that Centris, actually. Damn fine machine. Runs 7.5.5 like a breeze but I rarely fire it up except to get a nostagia dose.