CNC3AX card drives 3 unipolar motors directly from PC parallel port interface.
This card is software compatible with several applications such as Guillaume COQUERY's CNCFRAISE.
Motor types are unipolar, 40V, 5A per phase maximum. Do not forget to stick the MOSFET on an aluminium heat dissipator (over 2A/phase only).
http://www.techlf.com/cnc3ax-eng.php3