In the 1950s to 1970s, before the advent of semiconductors, magnetic-core memory played a crucial role as the main memory in early computers. This exhibit showcases the precision engineering behind TDK's contribution to this foundational technology.
Magnetic-core memory consists of tiny ring-shaped ferrite cores, just 0.36 mm in diameter, through which ultra-fine copper wires-thinner than a strand of human hair-are threaded. Approximately 1,400 cores are woven into just one square centimeter, highlighting the intricate craftsmanship of the time.
On display is an actual magnetic-core memory module that was long used in the lighting control system of Studio ALTA, a landmark building in Shinjuku, Tokyo. It was discovered during the studio's dismantling in 2025 and kindly provided by MARUMO ELECTRIC CO., the manufacturer of the control system.
To help you observe the fine details of this historic technology, the booth is equipped with a microscope and monitor. We invite you to take a close look at this rare piece of computing history and appreciate the precision that defined an era.
