029 Keypunch Restoration 5 - Breakthrough Day! Back to punching after 30 years.

From a channel Lumen includes in full: Marc Verdiell and team restore and reverse-engineer historic hardware (Apollo comms and guidance computer, HP test gear, atomic clocks) in long, technically exact episodes with schematics and measurements.

A 5-minute video from CuriousMarc's catalogue; the title names its topic.

Video by CuriousMarc, played through YouTube's embedded player.