Using the wrong adapter usually kills the 7805 regulator. That's an easy fix.

The rest is probably unaffected which means the EPROM is likely to work.
Just move it from the Cyclone PCB to the Drummer PCB, put that PCB in the
Cyclone enclosure and you have a working Cyclone (without your saved
presets; you need to make a complete reset).
It might be a good idea to replace the 7805 first, though.