A 2-Stage Pipelined Unlimited Register Machine Built in Conway's Game of Life

This article, the fourth in a series, details the construction of a (2-stage pipelined) Unlimited Register Machine (URM) in Conway's Game of Life. The URM, a Turing-complete four-instruction CPU, is shown factoring the number 15. The author describes the URM's design, including the ALU, register file, ROM, and instruction execution. Emphasis is placed on efficient circuit design in Game of Life, prioritizing circuit length over transistor count. A 2-stage pipeline is implemented to boost speed. The author concludes by announcing a future redesign for improved efficiency.