Hello - Keyboard Specialists' Expertise Needed

[nujwowe]

usHello geekhack community,

I have a piece of old musical gear that has a 10-key setup for entering note information for playback with a synthesizer. The keypad has gone dead and I have heard that there is an old IBM model keyboard that can serve as replacement parts. How would you suggest that I go about finding out which IBM keyboard is compatible. My electronic musical unit was manufactured in 1981, if that helps. I hope that you can help me as I am desperate!
I have pictures I can share if you need them.

 Thanks for your time and advice,
-Mike

[SpAmRaY]

The picture would be very helpful I'm sure.