Its possible to DIY nagnetic core memory. A search will reveal several kits .... EXAMPLE Weave Your Own Apollo-Era Memory A staggering 8 bytes of ferrite-core

Its possible to DIY nagnetic core memory. A search will reveal several kits .... EXAMPLE Weave Your Own Apollo-Era Memory A staggering 8 bytes of ferrite-core memory can be yours with the Core64 kit https://spectrum.ieee.org/weave-your-own-apollo-era-memory https://spectrum.ieee.org/weave-your-own-apollo-era-memory