I think my board is ver 1.2 and I don't need it, it works both ways.. I just made a board just to make things easier for me has all 8 motor ribbon cables to it and I used screw connectors to drivers also have the probe on it with switch for 10k or not, and have 6 screw connectors for home limit and the pokeys ribbon and Schmitt triggers, been testing about a week so far so good used just grounding switches. optic sensors. also the cheep 3d printer positive logic optic switches and all worked. may add more to board don't know only going with what I may need or want...
gary