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How about a PS2 keyboard run through a USB adapter (if there is such a thing)?


Yes, there are lots of such things, and they are (1) cheap, and (2) compatible with OSX and OS9. I have a couple of "USB notebook docking stations" here with built-in PS/2 sockets, and those work with my G3 box. But just plain USB-->PS2 dongles are also in many shops now.

Cheers