ISO 3561:1976 Preview
Information processing -- Interchangeable magnetic six-disk pack -- Track format
This standard was last reviewed and confirmed in 2010. Therefore this version remains current.
Specifies the track format characteristics for the six-disk pack to be used for data interchange (see ISO 2864). The 7-bit coded character set specified in ISO 646 has been adopted, though, by agreement between the interchange parties, the 7-bit or 8-bit extensions specified in ISO 2022 may be used.