You are making progress.
Try selecting Step Low Active for your X axis (Motor Outputs) and see if that makes a difference.
Also measure the voltage on your Parallel Port X axis Direction pin (between pin 3 and pin 25) it should change between approx. 0 volts when jogging in one direction and 5 volts when jogging in the other direction. If it only changes between approx. 0 volts and 3.3 volts then that may be the issue.
Tweakie.