1960s Core Store Memory
Some of the first memory systems used magnetic rings to store bits. Access time of several microseconds were around 10,000 times slower than modern memories. Storage capacities of 1 kbit were millions of times smaller than a modern memory device (billions of bits per chip). One Gigabyte of Core Store would cost around $14bn in today's money.
The Apollo moon lander control computer relied upon very similar "rope-memory" technology. Around that same time, integrated circuits started to become available and core store became obsolete.