Hi all,

I was wondering if someone could point me in the right direction. I,m looking for an image of what a good & a poor pulse wave form (Mach3) should look like on a scope.
I have been having trouble with my stepper motors making a "Knocking" noise and missing steps and have narrowed the problem down to the computer. Tried everything to fix it, trust me! Also my question is, if my computer can pass the Driver test on Mach3 with a "System excellent" , then can it only leave a "dodgy" parallel port that could be distorting my wave form? I have hooked a scope straight onto the PP with no BOB, driver or stepper connected and the wave form looks very ordinary. And before anyone asks, yes my computer does meet all Mach3 recommended requirements.
Thanks in advance

Regards Julian