Ferrite core memory

Ferrite core memory is an early form of computer storage that uses tiny magnetic rings, called cores, made of ferrite material. Each core can store one bit of information—either a 0 or a 1—by magnetizing it in a specific direction. The cores are arranged in a grid, allowing the computer to read and write data by applying electrical currents that change or detect the magnetic states. This technology was stable, non-volatile (retaining data without power), and durable, serving as the main memory in computers from the 1950s to the 1970s before being replaced by semiconductor memory.