Your basic music making computer! Motorola DSP machine. All analog stuff from original microwave is gone. The XT takes the innovation into a 5 rack space unit with 44 control knobs. The XTk puts this package in a 49 key keyboard. The "Terratic Microwave PC" is a sound card with a microwave II in a drivebay package.
Never worked on one.
Not sure what all might be in these yet. Ask if you need a specific part.