Mike, did you not receive Vladimir's response?
1. The 25-pin connector on the motherboard for printer port is a straight
cable. You can get it from local computer shop and ask for DB25M to DB25F
straight printer extension cable. If you use Mach-2 then you might need to
swap the STEP and DIR pins outputs in the Port setup.
2. I believe you have R990mb revision 030618. That one does not need the
resistor - only two links 1&2 and 3&4 when using tuning software. The
revision before that needed the 100 ohms resistor between 3&4.
This was my response:
Hmm...Sorry this is proving difficult.
A straight through db25 cable is otherwise known as a printer extension
cable, with male and female ends, so both are telling you the same thing.
Vladimir is just telling you to check to be sure that the step and direction
pins match your setup in Mach2, I believe. This would be set up in the
If I recall, the tuning software comes with pin connection instructions.
Just make sure you are set up according to those instructions for tuning.
Are you using Mach2? Art has set up the tuning software as part of Mach2,
but the tuning button on the displayed control does nothing. I have not
used the tuning software yet that Art has set up in Mach2, but there are
lots of posts telling of other's experience.