img-0815: HUH?
NO WAY!!!!!!!!
I do not know what is going on here, but no way should you get anything like that trace! It seems to show that the DIR line is pulsing in sync with the Step line. I have not put a CRO on my system, but I will stick my neck out and say this should NOT be happening! Dir is meant to be a 'static' state.
Second, and related: 1 v pulses? Something very faulty here.
Question: is this a bare PP output, or is there anything hanging off it?
Comment: either way, something has one (I hope just one) big internal fault. Either you have the wrong lines, or the PP has a major defect, or whatever is connected to the PP has a major defect. I just cannot believe Mach would pulse the Dir line like that. Far too much potential for disaster.
Step pulse is delayed about 2-3 uS on rise from Dir pulse. Both fall together.
Well, the step pulse making its rising transition a little time after the Dir pulse is right, but everything else is way wrong.
Positive news: you now have the means to properly investigate what is going on. With this gear you should be able to crack the bug.
Negative news: you have a fault somewhere ... but you knew that anyhow.
Also, I will be off the air for a week+ from Saturday. Sorry about that. Give you time to really explore combinations.
Cheers