Looks like ferrite beads in a core memory module. I believe they even used these on the space shuttle because the memory would be persistent even if the computer lost power unlike static & dynamic ram -- good for mission critical stuff, at least back then.
Learned about core memory back in 1994 in my Computer Architecture class for Software Engineering degree. [Humorous little side story about that class: In that class, we also simulated an 8 bit computer with 8 bit address space in LogicWorks. Built in modules (full of tons of gates) over the semester (ALU, registers, etc) to where we finally built the decoder and executed code. My little simulated computer worked where most other students didn't. I kind of cheated though because I didn't do the boolean algebra to simplify the decoder.. I was afraid I was going to make a mistake and wanted a functioning decoder, lol. I think most other students made algebraic errors, is why their decoder didn't work. My teacher caught on and kind of said I cheated because the decoder wasn't simplified, but he seemed very pleased it actually worked and gave me an A.]