Currently I am using a pc to drive a stepper motor through a xylotex-brand motor controller. The problem is the PC's time clock just doesn't allow for steady movement. What I need is a specific controller to handle the signal to the motor. All I want the PC to do is send a command to the controller saying "go here". I just do not have any experience with this, however, so your expertise would be greatly appreciated. I just need to know what device to use to enable smooth movement of the motor. Also, I would really like the controller to take in feedback from a linear encoder. FWIW, the xylotex controller uses simple ttl logic, with a 1.5v max LOW signal & 2.9volt min HIGH signal. Thanks!