Software, logic and 0's and 1's all fitting into this:
http://www.baesystems-ps.com/images/primary_flight_control.jpg
That's a A320 BAE flight control computer.
Yeah I think hella was getting a little confused, there are tons of racks down in the avionics bay, as I mentioned previously, the autoland systems requires a bunch of new kit to be installed, both internally and externally.