• Locally regular tasks can be carried out on virtually all classes of CNN chip prototypes built so far, whether they are implemented as continuous-time or as sampled-data systems, and whether a saturation or a high-gain nonlinearity is used. They are also executable on cellular automata. Locally irregular tasks, however, are inherently sensitive and therefore not guaranteed to run reliably on an analog chip. Consequently, as long as the accuracy of the CNN circuitry is not substantially improved, the dynamics in the linear region cannot be fully exploited. From a practical point of view, it is sensible to design chips with the type of nonlinearity that is easiest to implement.