of RISC architectures. Consequently, Green16 broadly follows the pattern of several successful RISC architectures. However, the goals of most RISC architectures are not pedagigical – moreover, RISC optimises for a dierent set of scarce resources. For this reason, there a number of small innovations in the design of the new architecture. The details of the design choices are presented in the next section, but they are informed by the following guidelines adapted from frugal innovation: