You can buy core memory kits [1] for adding core memory to an arduino. They only give 8x4 but you could get to "cordmp" with a five-bit encoding ;-)
The vendor, with whom I have absolutely no affiliation except for exchanging a few emails a several years ago, based his kits on a project that I did with a friend a long time ago [2].
It was a fun project that had interesting analog and digital sides to it.
[1] https://www.tindie.com/products/kilpelaj/core-memory-shield-...