Hi Guys, I run Marklin AC analog and dont know the first thing about digital.In a moment of madness I took in part trade alot of Roco and Fleischmann AC which are chipped. I dont know what chip is in them ,but the owner said he used an ECos controllor and that a Marklin controllor wont be to run them without the proper address. I am going to open up one of them to see whats what.Now as the motor is in tender will the chip be in the loco main body. Thanks Eddie