Even though you don't need an interface card to make the connections, it is nice to have one. There are two people that I know of that make them. One is Dan Mauch of Camtronics. And the other is a member of this board, Dean of Axxus Technologies. They both make a LPT board that is ready to connect to the step and direction pins. I kind of like Axxus's board. It cost a little more but he gives you a nice +5 Volt supply built on the board. You just need to get a 12 VDC wall wart from K-mart to connect it to the board. I just added this wall wart to my controller box and gave it power from the AC side of things.
Thanks
Jeff Davis (HomeCNC)
http://www.homecnc.info
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)