In the early days of computer technology, what type of memory had to be hand made rather than by machine?

In the early days of computer technology, what type of memory had to be hand made rather than by machine?

• Thin film memory
• EPROM
• Magnetic core memory
• Bubble Memory 

 

EXPLANATION

Magnetic core memory was almost always "woven" by hand in spite of repeated attempts to automate the process. Core uses tiny magnetic beads (the cores), through which wires are threaded to write and read information.

SOURCE

https://en.wikipedia.org/wiki/Magnetic-core_memory