On an Airbus aircraft, the Flight Augmentation Computers (FACs) control the rudder and have windshear detection, and the FACs also are responsible for speed computations. I know the FACs continuosly compute stall speed and compute the maximum speed but do the FACs also compute every other speed on the speed scale; VLS, alpha protection, alpha floor, green dot speed, flap retraction, etc., so basically the FACs compute every speed on the speed scale?
Yes. Kind of--the air data computers do some of the computations and display those based on hard coded limits. For example, an ADC will compute current AOA and may have the AOA limits hard coded therein.
The air data computers also provide input to the FACs, which further limit the aircraft speed envelope based on altitude, speed, and configuration. The FACs are necessary for configuration information and flight control positions.
Other examples of ADCs and their respective displays appear here and here. The first shows mechanical systems which compute a normalized AOA based, and later in the same article, a Gulfstream display shows feathers for Max AOA on the ADI, as seen here.