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.
And I am telling you that what I know ans daw (in my previous career, I was an aviation electrician and electronics tech). There are no mechanical connections between the yoke and the flight controls on an A-300. The A-300 has triple redundant flight control computers.
I suspect that we have a slight terminology problem here. The A-300 had flight control computers, but they were large and heavy and primitive by today's standards and, if I am not mistaken, analog computers vs. the digital computers of the A-320.
As I have implied, I have helped disassemble, inspect and rebuild several A-300's and dozens of 707's and DC-8's and 737's and 727's. There are only about 4 cables on an A-300.