Putting the MX222 next to the MX322 we can see that there are absolutely no differences in the controller/logic boards; actually, they’re the exact same model and revision. Only by a top view are we able to discern a difference between the models. As you can see in the second picture, the VFD screen is not protected by a shroud and the PCB extends just a tad bit deeper. “



Link: GruntVillE