I personally use an Arduino Mega as a SUSIC, and when setting up the node in JMRI define the number of input and output cards. I would suggest that you would be able to build the node in JMRI with 3 32bit input cards, a total of 96 inputs.?
Your constructor for creating a SUSIC node, CMRI cmri(CMRI_ADDR, 72, 0, bus); looks correct.?
You will need to update your code to call cmri.process() regularly, otherwise JMRI will not be able to poll properly. You should call this whether the inputs have updated or not.?
