This part of IEC 60843 specifies a method of auxiliary data recording and playback with the IEC 60843 8 mm video system. This part is applicable to both 525 line - 60 field and 625 line - 50 field television systems.
BS EN 60843-4:2001 history
2001BS EN 60843-4:2001 Helical-scan video tape cassette system using 8 mm magnetic tape. 8 mm video. Video subcode (VSC)