I have an Excello 602 with 1.5 volt 20 amp slo-syn stepper motors. The motors are omnipolar I believe (6 wire). I want to control the machine with a laptop and wondered what I would need between the laptop and the motors. I'm thinking of using an interface for 3 stepper motor drivers and the computer. That should also take carre of my power supply but what kind and or size drivers will I need and is there anything else to be added? If you have any ideas it would be a great help....Joe