@kenshirriff @foone but ... WIRELESS? In the year of the Lord 2000 ? Amazing! The antenna seems to hint at something in the 100 to 400MHz range (radio, teevee). I wonder what the protocol looked like. #AT commands in plaintext?
Amazingly, the X10 website is still alive, and apparently they've heard that USB is also a thing now.
https://www.x10.com/products/cm17a