This standard is for an unrecorded minicassette containing 3.81-mm (0.15-in) magnetic tape represents the minimum requirements for mechanical and magnetic interchangeability of the minicassette between information processing systems, communications systems, and associated equipment, using ASCII, ANSI X3.4-1977. This standard refers solely to the magnetic tape minicassettes for digital recording. It will support American National Standards for recorded minicassettes.