Rich, Funny you show that. I run my Sherline table with my Hobby Cnc Pro controller and it works great. Recentlly I configured a G540 to another machine of mine (Dyna DM2400) and all 3 axis work except the A though I am not sure why just yet. I would enjoy doing a back to back test of the Hobby Cnc Pro against the G540 with the same power supply. I like the G540 and its simplicity but havent seen any performance advantages. I cant really compare apples to apples though since the machines are entirely different regarding leadscrews and gear reductions. I dont really want to do the comparo, just curious of the differences. I really havent tried to analyze the issue or even double checked that output of the G540 with a known good configuration for a stepper (swapping x,y and or z into the A port and changing the tuning values). I was in the process of building jumpers and other small wiring jobs and briefly tested it. Because I am using the stepper on 2 different machines, my jumpers can and or will vary the pins and hopefully it will work. Not high on the priority list just yet.