Home / Standards / GB/T 1989-1980 GB/T 1989-1980 Active Methods for indication of the 7-bit encoding character set for information processing switching on 12.7 mm magnetic tape 信息处理交换用七位编码字符集在9磁道12.7 毫米磁带上的表示方法 Standard Type GBT ICS 35.040 CCS L71 Status 现行 Issue Date 1980-07-10 Implementation 1980-12-01 Responsible Dept 国家标准委 Drafting Unit N/A