From the article:

>Once the code was solid, it would be shipped off to a nearby Raytheon facility where a group of women, expert seamstresses known to the Apollo program as the “Little Old Ladies,” threaded copper wires through magnetic rings (a wire going through a core was a 1; a wire going around the core was a 0). Forget about RAM or disk drives; on Apollo, memory was literally hardwired and very nearly indestructible.

I was at a talk by Richard Battin, also of Draper on the Apollo program, a few years back. One of the stories he told was of a number of the Apollo astronauts visiting Raytheon (where the core memory was being "sewn") and the general gist of the visit was "be really careful with your work or these nice young boys could die."