Ken Shirriff's blog

Computer history, restoring vintage computers, IC reverse engineering, and whatever

Reliable after 50 years: The Apollo Guidance Computer's switching power supplies

We recently restored an Apollo Guidance Computer, the revolutionary computer that helped navigate to the Moon and land on its surface. 1 At...

Looking inside a 1970s PROM chip that stores data in microscopic fuses

The MMI 5300 was a memory chip from the early 1970s, storing 1024 bits in tiny fuses. 1 Unlike regular RAM chips, this was a PROM ( Progra...

Apollo Guidance Computer: Dipstiks and reverse engineering the core rope simulator

Onboard the Apollo spacecraft, the revolutionary Apollo Guidance Computer helped navigate to the Moon and land on its surface. The AGC'...

Bitcoin mining on an Apollo Guidance Computer: 10.3 seconds per hash

We've been restoring an Apollo Guidance Computer 1 . Now that we have the world's only working AGC, I decided to write some code for...

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