Occasionally, you will run across a keyboard that's been blown by a reverse-connected cable, but it's rare. The RJ11 connector is wider than the one used in the Mac, so you have to shave it down to fit. If the original cable is still attached to that keyboard, it's even less likely that this is the problem.

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I don't think wally was talking about a phone cord of type RJ11 that string into the wall, but the phone coiled cord that plugged into the handset of the phone itself. This one as the same connector as the Mac 128K keyboard. It is a kind of RJ11 with thinner connector.

That said, I have the original keyboard cable. One told me that the phone handset keyboard should work, try it, does not, know I know why. But the keyboard was not working before that's for sure. I'm surprise that this could burn the keyboard so far...

I can also try to validate the cable pins with a multimeter to see if the cable has all pins connected pass throught, too, now that I know the pin-out.

Finding a new keyboard for the Mac is rare, unless someone has this handy somewhere!