Abstract Ising machines are hardware accelerators for combinatorial optimization and probabilistic sampling. using stochasticity to explore spin configurations and avoid local minima. We refine the previously proposed coupled chaotic bits (c-bits). which operate deterministically. https://safeersappliancers.shop/product-category/liebherr-ikbp2760-biofresh-performance-140cm-built-in-integrated-larder-fridge/