Hi, Radioactive
If your not running Warp9 Smooth-Stepper Board, It's a USB device, When you start Mach3 select the Normal Printer Port Control, Then verify that SStepper Plugin is X'd out in Plugin's page.
PM message your phone # by clicking on my user name, I'll give you a call tonight at 9:00 FL time, If your in US or CA.
Chip