hmmm- that could be a sticking point then. wonder if their add on boards work?- but then its becoming an expensive system.
some of my machines ive converted have over 110 i/o in use . thats always been the crunch to what controller can be used .
does it suport modbus? if so i have arduino megas running here for extra i/o (ive had 6 running 300 i/o no problem with uccnc and mach3)