2026 Retrocomputing Challenge: 16-Bit Homebrew Relay Computer

We did, when we started our retrocomputing challenge. [Peter] decided that transistors weren’t retro enough, and sent us this lovely homebrew relay computer , complete with 16- bit CPU, which is rather more bits than one normally associates with clicky clacky contacts. The architecture is very simple– it just uses an accumulator register, ACCU, and goes from there.