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Originally Posted by somdcomputerguy
Away from email a bit, computers in general: I remember my dad telling me about 4k memory 'chips' he repaired. By wrapping wire around a core stick..
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I think you must be referring to magnetic core memory planes:
https://en.m.wikipedia.org/wiki/Magnetic-core_memory
I used computers which made use of core memory in the 1970’s and also managed technicians repairing systems containing such memory. The actual repair of the core memory planes themselves (the cores and associated wiring) was a specialized job which required training, a steady hand, a microscope, and special tools. By the mid-1970’s the price and performance of semiconductor memory (static TTL RAM and dynamic MOS RAM) replaced magnetic core memory for new projects.
The early MOS dynamic RAM chips contained only 1,024 memory bits. So 1 M bytes of such memory would have required 8,000 of those IC’s! A minor breakthrough happened when the MOSTEK 4116 dynamic memory chips were introduced with 16 k bits of memory.
http://smithsonianchips.si.edu/augarten/p50.htm
Bill