Controls.dat is a project started by Kevin Jonas (SirPoonga) with the help of Howard Casto. This project was started to accurately document the controls and button labels of the arcade control panels from the games in M.A.M.E.. The goal of this project to accurately document M.A.M.E. outputs by using the labels the games used on their control panels. The benefit of this is frontend developers can use these resources to display the controls for the games.
Many volunteers have entered in the data for this project. I'd like to thank all the volunteers for the hard work they have done.