1960's Style - Repairing Computer Memory
Back in the 1960's - when I was but a slip of a lad - there were mainframe computers. They were cool tech, but they were also big, slow and surprisingly mechanical. At that time, there was no DRAM; computers of the time used ferrite core memory, consisting of a (usually hand made) spiderweb lattice of wiring and tiny toroids of ferrite making up the computer's RAM.
ExtremeTech has a fascinating article about the care and feeding of such a piece of computer history.