Hi Woodie, did you find out what the problem was/is? I'm having exactly the same issue. I've been battling with cheap USB / 4 axis drivers to get around my CNC 3040's parallel port issue, but to no avail. Finally I too bought one of these TC55Hs and am just aching to get on a do some milling, but in one direction only? I think my wiring's right, but I struggle with the ins and outs of common grounds ignoring enable signals etc. etc. I just want the bloody thing to cut stuff.