The A-300 I worked on 15 years ago was (former Easter Airlines plane). The only cables on the whole aircraft were to either the fire bottles or the fuel shut off (maybe both, can't remember).
http://www.airbus.com/media/fly_by.asp
Fly-by-wire is an electronically managed flight control system, which uses computers to make aircraft easier to handle while further enhancing safety. First introduced on a commercial jetliner on the Airbus A320 in 1988, it has become an industry standard.