ISO/IEC INTERNATIONAL STANDARD 1863 Secondedition 1990-05-01 Information processing --- 9-track, 12,7 mm (,5 in) wide magnetic tape for information interchange using NRz1 at 32 ftpmm (800 ftpi) - 32 cpmm (800 cpi) Traitement de I'information - Bande magnetique a 9 pistes de 12,7 mm (0,5 in) de large, pour I'echange d'information, empioyant NRZ1 a 32 ftpmm (800 ftpi) 32 cpmm (800 cpi) Reference number ISO/IEC1863: 1990 (E) Copyright Intemational Organization for Standardization No reprod dbyIHS Not for Resale ISO/IEC1863:1990(E) Foreword ISo (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardiz- ation. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and tEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. International Standard ISO/IEC 1863 was prepared by Joint Technical Committee ISo/IEC JTC 1, Information technology. This second edition cancels and replaces the first edition (ISO 1863 : 1976), which has been technically revised. Annex A forms an integral part of this International Standard. Annexes B and C are for information only. ISO/IEC 1990 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. ISO/IEC Copyright Office · Case postale 56 . CH-1211 Geneve 20 · Switzerland Printed in Switzerland Copyright Intemational Oorganizatin for Standardization d without license from IHS Not for Resale INTERNATIONAL STANDARD ISO/IEC 1863: 1990 (E) Information processing - 9-track, 12,7 mm (0,5 in) wide magnetic tape for information interchange using NRz1 at 32 ftpmm (800 ftpi) - 32 cpmm (800 cpi) 1 Scope 3 Definitions This International Standard specifies a format and recording For the purpose of this International Standard, the following standard for9-track,12,7mm(0,5 in)magnetic tape to be used definitions apply. fordata interchangebetween information processing systems, communication systems, and associated equipment utilizing 3.1 magnetic tape: A tape which will accept and retain the 7-bit coded character set (see ISo 646), its extension in magnetic signals intended for input, output and storage pur. ISo 2022 where required, and the 8-bit coded character set poses on computers and associated equipment. (see ISO 4873). Magnetic labelling for use on magnetic tape is the subject of Iso 1001. The magnetic tape and reel to be used shall conform to ISo 1864 and/or ISO 8064. 3.2 reference tape: A tape which has been selected for givenproperties for use incalibration. NOTE -- Numeric values in the SI and/or imperial measurement system in this International Standard may have been rounded off and 3.3 Master Standard Reference Tape: A reference tape therefore are consistent with, but not exactly equal to, each other. Either system may be used, but the two should be neither intermixed selected as a standard for signal amplitude. nor reconverted. The original design was made using the Imperial measurement system. NOTE - A Master Standard Reference Tape has been established by the US National institute for Standards and Technology (NIST). 3.4 Secondary Standard Reference Tape: A tape the per- 2 Normative references