This standard for an unrecorded cartridge containing 0.250-inch (6.30 mm) magnetic tape presents the minimum requirements for the mechanical and magnetic interchangeability of the cartridge between information processing systems, communications systems, and associated equipment using the American National Standard Code for Information Interchange, ANSI X3.4:1977 (ASCII). This standard refers solely to the magnetic tape and standard length or long length cartridges for digital recording and complements American National Standard, ANSI X3.56:1977.