CuriousGeorge113 was the first one to write us about the homemade HERF gun an engineer unveiled at Infowarcon '99. All stuff that you can buy from a hardware store, and disable computers at varying range, depending on size. The current model does not do permanent damage, unlike EMP.
"Today's robots are very primitive, capable of understanding only a few
simple instructions such as 'go left', 'go right', and 'build car'."