Ferrite core memory was the dominant computer memory technology from the 1950s to the late 1970s. Before we delve into the repair of our Apollo AGC core memory, I thought it would be good to explain how they work, as they are very different from modern semiconductor memory.

Check out our Russian core memory follow up video here:    • Playing with Soviet Era Ferrite Core Memor...  

Ken Shirriff has some of the best core memory write ups I know of, here:
http://www.righto.com/2015/08/examini...
This one details the AGC core memory:
http://www.righto.com/2019/01/inside-...
We also found this page from Brent Hilpert very helpful:
http://madrona.ca/e/coremem/index.html

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