Hi Mactec, thanks for your responce. No there is no configuration on the board itself, at least none that I can physically see or that are referenced in the manual. The power is connected correctly as well.
machinehop5, Thanks but i've been over all the Mach3 settings several times. I've set it up per the manual, per the C6 manual, and per the smoothstepper manual, and none of those settings seem to help (or hurt) the issue.
It's seeming like i really need a scope to propperly diagnose this issue.
The smoothstepper manual highly recommends a PWM based board, so I may spend a few $$ and give one of those a try. I've also heard that port1 seems to have some issues with spindle control. Anyone heard of this before or have any first hand experience with it?