Ken Shirriff on Twitter: "Communicating hundreds of thousands of miles during the 1969 Moon landing was difficult. On the Apollo spacecraft, the "premodulation processor" was very important, combining voice, data, and TV signals. I got my hands on a premodulation processor, so let's look inside. 🧵… https://t.co/PZqmwaZC3F"

Computer history. Reverse-engineering old chips. Restored Apollo Guidance Computer, Xerox Alto. Put ₿ in Unicode. PhD. Ex-Google, Sun, Msft. So-called boffin.

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Communicating hundreds of thousands of miles during the 1969 Moon landing was difficult. On the Apollo spacecraft, the "premodulation processor" was very important, combining voice, data, and TV signals. I got my hands on a premodulation processor, so let's look inside. pic.twitter.com/U1ir3DF7wb

The premodulation processor is a 14.5-pound box, one of many electronics units mounted in the Apollo Command Module. We removed the screws from the case so we could access the complicated electronics inside, a stack of 11 modules.pic.twitter.com/cQZrjLfIQo

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