is played at 3.75 inches per second (twice the speed of a cassette), is wound around a single spool, is about 0.25 in wide and contains eight parallel tracks. The player's head reads two of these tracks at a time, for stereo sound. After completing a program, the head mechanically switches to another set of two tracks, creating a characteristic clicking noise.

History

Development

Inventor George Eash came up with a design in 1953, called the Fidelipac cartridge, or the NAB cartridge,

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