Magnetic core memory: Random access, Computer memory, Ceramic, Magnetic field, Polarity (physics), Core dump, Delay line memory, Twistor memory, Bubble ... Random Access Memory, Ferroelectric RAM

Magnetic core memory, also known as Forrester memory or ferrite-core memory, is an early form of random access computer memory. It uses small magnetic ceramic rings, the cores, through which wires are threaded to store information via the polarity of the magnetic field they contain. Such memory is often just called core memory, or, informally, core. Although computer memory long ago moved to silicon chips, memory is still occasionally called "core". This is most obvious in the naming of the core dump, which refers to the contents of memory recorded at the time of a program error.