This article discuss the way to control a Stepper Motor using the Parallel Port of the PC. The parallel port signal is controlling the speed, the direction and the step size of the motor. [via]
If you are interested in robotics, motion control, or just want to learn about this widely used motor in almost every electronic gadget like floppy drives, printer, scanner, robots, every device; then you should try building this versatile stepper motor control.
Stepper Motor Control through Parallel Port – [Link]