You need a stepper motor for each axis, a power supply capable of supplying the necessary voltage and current, electonics to interface from the computer parallel port to the motors. That can be one board or multiple. Some more info that might help:
http://pminmo.com/drivers.htm
http://pminmo.com/pport/pport.htm
http://pminmo.com/simpleps.htm
http://www.pminmo.com/
Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
Vist my websites - http://pminmo.com & http://millpcbs.com