This Standard ECMA-56 is intended to provide mechanical an functional interchangeability requirements for self-loading cartridges, to be used with reels of 12,7 mm wide magnetic tape.
Minimum dimensional and functional requirements of the cartridge are given, in order to ensure interchangeability of cartridges between tape drives designed for self-loading operation.
Some dimensions and features, other than those strictly required for interchangeability, are also given but have to be considered as recommended or optional.
Requirements are also given for the magnetic tape and the reel to be used in conjunction with the cartridge.