There is a Robot, a Toymax RAD from 1998, which is missing a controller (49Mhz).

It could be a project someone to work on.

Some maybe useful links… - https://robotsupremacy.fandom.com/wiki/R.A.D._1.0 - http://radhack.blogspot.com/ - https://www.theoldrobots.com/rad.html - https://community.robotshop.com/forum/t/rad-1-0-hack-airsoft-battle-droid-by-josh-starnes-powered-by-ez-robot/5869