Quote Originally Posted by JAZZCNC View Post
So if you still have 4th axis spare then you must be controlling 2 drives with 1 output.?

Yes, that is the whole point of this board I made, it enables the use of a single axis controller output and single home input to safely drive and also correctly home/resquare a dual motor axis with dual home switches. The controller executes its normal procedures without any knowledge that there are two motors and two switches.