The keyboard is actually serial. It fits into the serial port of the newton. You likely won't be able to make it work with a mac. maybe a pc, but that's about it. For some reason, Apple never incorporated an ADB port on the newton. Such a shame, an ADB Mouse + Touchscreen woulda been t3h 4w3s0m3
(sorry, just HAD to do that, but seriously, it would be awesome to use a mouse on a newton. Ironically, there was a program that allowed to newton to be used as a graphing tablet for a mac where you moved the stylus on the screen of the newton, and it moved the mouse on the machine you had it hooked to. Not sure of what it was, but my brother had it working on his PowerBook Duo 2300c. Was *really* cool.)