 To include all this function on one chip, the transputer's core logic was simpler than most CPUs.While some have called it reduced instruction set computer (RISC) due to its rather sparse nature, and because that was then a desirable marketing buzzword, it was heavily microcoded, had a limited register set, and complex memory-to-memory instructions, all of which place it firmly in the CISC camp.Unlike register-heavy load/store RISC CPUs, the transputer had only three data registers, which behaved as a stack.