However, I'm like 90% sure that this can be made easier using p3/p4 controllers through the famicom expansion port. In particular, Hydrantdude and I found a con

However, I'm like 90% sure that this can be made easier using p3/p4 controllers through the famicom expansion port. In particular, Hydrantdude and I found a consistent enough setup using the single at 1489 lines (pushdown gives you a 50% chance, and I think). This setup would even allow crude human-possible ACE. Right now we're limited to small payloads (I made a proof of concept that activates the unused two player mode), but more sophisticated setups might give us more power.