GB/T 9363-1988
信息处理 信息交换用9磁道、12.7mm(0.5in)磁带成组编码方式246cpmm (6250cpi)的格式及记录
Information processing--9-Track, 12.7mm(0.5in) wide magnetic tape for information interchange--Format and recording,using group coding at 246 cpmm(6250 cpi)
GBT9363-1988, GB9363-1988