SECS/GEM and GEM300, Step by Step

Every exhibitor at nine SEMICON shows in 2026 and four 2025 editions, plus the SEMI member directory, merged into one catalog of 6,791 companies and sorted into suppliers, customers and the wider ecosystem from the point of view of a semiconductor equipment builder.

Flow is a tool controller I am building from scratch: it owns the state of a whole tool, moves payloads between robots and stations, and drives every device from configuration alone. This post walks through the equipment and software modules, the single native executable and statechart engine, permits and staged transfers, the event-sourced Core, configured recovery, booting the tool, two sample tools, routes and jobs, the deadlock check and timing model, sequences, and Flow UI, along with what went wrong on the way. Flow is still in development, and this post is updated as each milestone lands.

An overview of Atom, a 2010 Core i5 desktop turned home server: storage and Samba, the Jellyfin and MediaBox media stack, Tower as the control plane, FinanceTracker and other personal apps, Pi-hole and Tailscale, and the smart-home devices it drives — with links to every post in the project.

Two months after Part 2, Tower moved from the inbox to the building: LAN loop detection after a real outage, a Wi-Fi topology map, AC infrared learned locally and derived for every temperature, energy and climate per room, a self-labelling CCTV classifier, a to-scale house schematic, and a 6x cut in idle CPU.