This International Standard specifies a 7-track, 8 rows per millimetre (rpmm) [200 rows per inch (rpi)] 12,7 mm (0.5 in) wide magnetic tape for interchangeability of tape between information processing systems which utilize 6and 7-bit coded character sets, the latter being as specified in ISO 646. It refers solely to magnetic tape for digital recording, on which the direction of magnetization is nominally longitudinal as opposed to nominally transverse. NOTES 1 Certain other aspects of coding requirements, such as significance of binary digits, sequence of characters, filling of unused positions and magnetic labelling for use on magnetic tape, are the subject of ISO/R 961 and ISO/R 1001. 2 Details of unrecorded tape and reels are specified in the complementary publication, ISO 1864.