He's looking to control 6 motors from the port. Unless only one motor will turn at a time, I dont think it's possible. And if it is possible, it might be pretty slow. You might want to look into using the serial port.
my idea basically is to read input signals from a joystick and use it drive a stepper motor which in turn drives a car . i plan to extend this joystick movements to the accelerator and brake also . Could you also tell me what is the highest torque stepper motor that you have heard of and where i could get one. thanks for all the help.