Yes, I am interfacing to the old Boss Stepper Drives which are quadrature.
Here is something interesting I tried, to determine if it is noise or Mach actually sending a signal to the parallel port:
1) I disconnected all connections out of my BOB, so the BOB was only attached to the PC.
2) From the Diagnostics page I ref X, ref Y, and ref Z and record what each of the LED's for each axis are.
3) I then jogged each axis .002" (obviously this was only the screen DRO's that i jogged since the BOB was not connected to the machine) once again i record what each of the LED's states is.
4) I then disconnected the BOB from the PC.
5) Clicked Ref X, Ref Y, and Ref Z.
6) Reconnected the BOB and the LED's have Changed state to the same state they where in after step 2.
So I am positive Mach is sending signals to the Axis even though homing is disabled on these axis.
I can bring an Oscillascope home from work and connect directly to the parrallel port pins and verify this but I am positive I will see the same result, that for some reason mach sends a signal to the axis port pins when ref'd even when homing is disabled. If it is noise then it would have to be internal to the PC, there is no chance I could fix that!!
Although a new PC would be nice!!
I am running mach3 2.0 version R2.63
I am going to install the latest version and see what happens.
Thanks again,
John