Hi
I have an eazi turn and have converted it to Mach3 used the original drivers and steppers works just fine, all I used was and interface board to take the printer port to the interface (can be found on E Bay) and connected the outputs to the original stepper drives, the spindle I did replace the spindle drive controller for a Sprint 180v unit and this is now controlled by another Interface completely isolated from the drive and the PC ... not to let out the magic smoke that all electronic components are made with!!
I will post some pics of the guts of my machine if that will help
Best regards
Paul h