The E0227-702-004 Bubble Memory Card is a vintage 2Mbit product manufactured by Okuma. It uses a non-volatile computer memory system that relies on tiny magnetized areas, known as "bubbles" or domains, in a thin magnetic film. Each bubble stores one bit of data, making it similar to delay line memory systems. Developed as part of the Opus 5000 range in 1967, this card weighs around 1lb and measures 11 by 6 by 1 inch. While not widely used in modern systems, it allows data storage that persists even when the computer is off. The card features orthogonal coils situated beneath the magnetic plate surface, connected to a user system that includes diode arrays, coil drivers, a sense amplifier, and a controller. Notably, these components are also linked to the bubble chip which incorporates chevron propagation elements, a Ni-Fe guide, a bubble domain, and a non-magnetic substrate.
