Apollo Guidance Computer Restoration Draws Press — and Finds Lost Code

A crowd-sourced rescue mission

A ragtag team of hobbyists and historians has been painstakingly restoring an Apollo Guidance Computer (AGC), and the work is getting noticed. CuriousMarc’s playlist collects the videos — deep dives, teardown clips, and triumphant debugging sessions — while mainstream outlets have taken a peek: it has been reported that the Wall Street Journal ran a video feature, and there's a local write-up claiming the restored unit was coaxed into running Moon-landing routines. Want an audio deep-dive? There’s an almost two-hour podcast with the full restoration team for those who like their tech history served long and hot.

Open-source archaeology and meticulous documentation

This isn’t grease-and-glue weekend tinkering. The project leans on the Virtual AGC archive — Ron Burkley and Mike Stewart’s decades-long, Herculean cataloguing of schematics, manuals, and scanned hardware docs. The restorers provide downloadable schematic ZIPs, original Block II handbook scans, X-ray files of core memory modules, and even 38-gauge weave patterns for anyone brave enough to reweave core planes. Samtec remade Malco connectors. Mike Stewart built gate-accurate FPGA replicas of the AGC and its test gear; the source is public for those who can make sense of it.

Hardware, software, and a little bit of magic

This is hands-on history: the team has fixed memory modules, traced inhibit wires, and reverse-engineered core-rope modules — the read-only magnetic cores that once housed mission code. Many contributors have replicated AGC hardware before (shoutout John Pultorak’s early TTL Block I replica), but the restoration’s combination of physical repair, FPGA simulation, and archival research is rare. For the technically curious, the project links to GitHub repos for FPGA work, SCD drawings for connectors, and notes on driving the original electronics. It’s like Indiana Jones for engineers — minus the boulder, but with more soldering irons.

Why this matters

Emotionally, the key moment is simple: reading code once thought lost. It has been reported that the team has recovered nine core-rope modules so far, including pieces of Retread 50, parts of Sundance, and a complete Sundial-E. Those bits of software are more than curiosities; they fill in gaps in the story of how the Apollo guidance system actually behaved in flight. In an era when software archaeology is becoming a thing, this project shows the power of community, open archives, and stubborn craftsmanship to bring a tiny, blinking chunk of history back to life. Who knew vacuum tubes and core memory could still make your heart skip a beat?

Sources: curiousmarc.com, Hacker News