I have a PR96 that I purchased back in 2000 and have always run the original ShopBot software version 221. My old 486 computer finally died and I have now dedicated an older laptop with XP, to running my PR96. The ShopBot software installed on the laptop is 3.4.27. I have upgraded the control box firmware from the laptop and connection has been made. Distances are off and I’m not sure by how much. I entered my original unit values but that did not seem to work properly. I now need unit values for x,y, and z. ShopBot support told me that the Z value is transferred directly from dos but I think I screwed that up when I entered all my original values. The gears on my stepper motors have 20 teeth. Any help is greatly appreciated.