1. Information processing. Unrecorded 12, 7 mm (0.5 in) wide magnetic tape for information interchange. 32 ftpmm (800 ftpi) NRZ1, 126ftpmm (3 200 ftpi) phase encoded and 356 ftpmm (9 042 ftpi), NRZ1. (31st January 1992) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (19 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗