The digital ising thing was a very interesting line of research that Fujitsu has been trying to sell for 10 years or so: https://www.fujitsu.com/global/services/business-services/di...

They presented their v1 chip architecture at ISSCC in 2015 much to the consternation of a few quantum computing people who (rightly) objected to the characterization of it as an "Ising" chip, because it cannot represent superposition.

It's a pretty cool sort of system that should be able to solve pseudo-energy-minimization problems, but they are only theoretically sound when energy minimization corresponds to minimizing a Lyapunov function. Sadly, it's not clear that there is a way to generically construct a Lyapunov function with a minimum that corresponds to an NP-complete problem. The Fujitsu device supposedly is good at "easy" versions of problems, but so is a SAT solver.