1、ADOPTED FOR USE BYTHE FEDERAL GOVERNMENTSEE NOTICE ON INSIDEANSI INCITS 72-1981 (R2003)(formerly ANSI X3.72-1981 (R1998) Parallel Recorded Magnetic TapeCartridge for Information Interchange4 track, 0.250 inch (6.30 mm),1600 bpi (63 bpmm), Phase EncodedPUB 93This standard has been adopted for Federal
2、 Government use. Details concerning its use within the Federal Government are contained in Federal Information Processing Standards Publication 153, Programmers Hierarchical interactive Graphics System (PHIGS). For a complete list of the publications available in the Federal Information Processing S
3、tandards Series, write to the Standards Processing Coordinator (ADP), National Institute of Standards and Tech- nology, Gaithersburg, MD 20899. AmericanNationalStandardApproval of an American National Standard requires review by ANSI that therequirements for due process, consensus, and other criteri
4、a for approval havebeen met by the standards developer.Consensus is established when, in the judgment of the ANSI Board of StandardsReview, substantial agreement has been reached by directly and materiallyaffected interests. Substantial agreement means much more than a simplemajority, but not necess
5、arily unanimity. Consensus requires that all views andobjections be considered, and that a concerted effort be made toward theirresolution.The use of American National Standards is completely voluntary; their existencedoes not in any respect preclude anyone, whether he has approved the standardsor n
6、ot, from manufacturing, marketing, purchasing, or using products, processes,or procedures not conforming to the standards.The American National Standards Institute does not develop standards and will inno circumstances give an interpretation of any American National Standard.Moreover, no person shal
7、l have the right or authority to issue an interpretation ofan American National Standard in the name of the American National StandardsInstitute. Requests for interpretations should be addressed to the secretariat orsponsor whose name appears on the title page of this standard.CAUTION NOTICE: This A
8、merican National Standard may be revised orwithdrawn at any time. The procedures of the American National StandardsInstitute require that action be taken periodically to reaffirm, revise, or withdrawthis standard. Purchasers of American National Standards may receive currentinformation on all standa
9、rds by calling or writing the American National StandardsInstitute.Published byAmerican National Standards Institute11 West 42nd Street, New York, New York 10036Copyright 1981 by Information Technology Industry Council (ITI)All rights reserved.No part of this publication may be reproduced in anyform
10、, in an electronic retrieval system or otherwise,without prior written permission of ITI, 1250 Eye Street NW,Washington, DC 20005.Printed in the United States of AmericaANSI X3.72-1981 American National Standard Parallel Recorded Magnetic Tape Cartridge for Information Interchange, 4 Track, 0.250 in
11、ch (6.30 mm), 1600 bpi (63 bpmm), Phase Encoded Secretariat Computer and Business Equipment Manufacturers Association Approved March 13, 1981 American National Standards Institute, I nc Foreword (This Foreword is not part of American National Standard Parallel Recorded Magnetic Tape Cartridge for In
12、formation Interchange, 4 Track, 0.250 inch (6.30 mm), 1600 bpi (63 bpmm), Phase Encoded, ANSI X3.72- 1981.) This American National Standard presents the standard technique for parallel recording of the American National Standard Code for Information Interchange, ANSI X3.4-1977 (ASCII), on a magnetic
13、 tape cartridge at 1600 bpi (63 bpmm), using phase recording techniques. It is one of a series of standards implementing the ASCII in media. Related standards define more fully the physical and magnetic properties of the magnetic tape cartridge and specify a standard record format and labels. The X3
14、B5 Technical Committee on Magnetic Tape Cassettes, which developed this document, consists of a group of experienced and qualified specialists on the recording of digital informa- tion on magnetic tape. In the development of this standard careful consideration was given to current practices, exist-
15、ing equipment and supplies, and the broadest possible acceptance, and to providing a basis for future improvement in the use of the medium. Suggestions for improvement of this standard will be welcome. They should be sent to the American National Standards Institute, 1430 Broadway, New York, N.Y. 10
16、018. This standard was processed and approved for submittal to ANSI by American National Stan- dards Committee on Information Processing, X3. Committee approval of the standard does not necessarily imply that all committee members voted for its approval. At the time it ap- proved this standard, the
17、X3 Committee had the following members: John F. Auwaerter, Chairman John A. N. Lee, Vice-Chairman Catherine A. Kachurik, Secretary Organization Represented AM International . . . . . . . . . . . . . . . . . . . . . American Nuclear Society American Society for Information Science American Society of
18、 Mechanical Engineers Association for Computing Machinery . Association for Systems Management . Association of American Railroads. Association of Computer Programmers and Analysts. Association of Computer Users . Association of Data Processing Service Organizations Burroughs Corporation. . Computer
19、 and Communications Industry Association Control Data Corporation Data General Corporation Data Processing Management Association . Digital Equipment Computer Users Society Digital Equipment Corporation . Edison Electric Institute . General Services Administration GUIDE International. . . . . . . .
20、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ., . Name of Represen tative Joanne Gerg Ace McInturff (AR) Lawrence L. Barinka D. R. Vondy (AR) Charles Goldstein Daniel J. Schuster John A. N. Lee Pat Skelly (AH) Richard L. Wexelblat (Ah) Wallace
21、 R. McPherson, Jr Richard Irwin (Alt) R. A. Petrash John Prior, Jr T. G. Grieb (Ah) Hillel Segal Thomas Kurihara (Ah) Bruce R. Wilson Jerrold S. Foley Michael J. Bedford (Ah) Norman J. Ream A. G. W. Biddle (Ah) Charles E. Cooper Keith Lucke (Alt) Anthony M. Goschalk Jit Saxena (Ah) Ardyn E. Dubnow S
22、teve Jost (Ah) Patricia Caroom John Barr (Ah) Patricia W. White Howard Kaikow (Alt) S. P. Shrivastava William C. Rinehuls Frank Kirshenbaum Leland Milligan (Alt) Organization Represented Harris Corporation Hewlett-Packard. . Honeywell Information Systems IBM Corporation . IEEE Communications Society
23、 . IEEE Computer Society . Lawrence Berkeley Laboratory . Life Office Management Association Mohawk Data Sciences Corporation National Bureau of Standards. . National Communications System . National Micrographics Association. NCR Corporation. OCR Users Association. . Ohio College Library Center. Pe
24、rkin-Elmer Corporation Prime Computer. . Recognition Equipment, Inc. Scientific Apparatus Makers Association. . SHARE,Inc . Society of Certified Data Processors Sperry Univac . Telephone Group. 3MCompany . U.S. Department of Defense. U.S. Department of Health and Human Resources VIM Xerox Corporatio
25、n. . Name of Representative Richard Joyce Ed Younker (AR) Donald C. Loughry Thomas J. McNamara Eric H. Clamons (Ah) William F. McClelland Caryl A. Thorn (Ah) Thomas A. Varetoni Herbert Hecht Robert S. Stewart (Ah) James A. Baker D. F. Stevens (Ah) Richard E. Ricketts James F. Foley, Jr (Ah) Don Book
26、walter Jon Cave (AR) Robert E. Rountree James H. Burrows (Alt) Marshall L. Cain George W. White (Ah) Robert Glotfelty William E. Neale (Alt) Thomas W. Kern A. Raymond Daniels (Alt) Herbert F. Schantz James E. Rush David Ellis Dave Lowry (Ah) Winfried Burke Charles Tinkey (Ah) William E. Viering Abra
27、ham Savitsky Thomas B. Steel, Jr Robert H. Wahlen (Ah) Thomas M. Kurihara Ardyn E. Dubnow (Alt) Marvin W. Bass Charles D. Card (Ah) V. N. Vaughan, Jr S. M. Garland (Alt) R. M. Shaw (Ah) R. C. Smith William LaPlant Beth Weinberger Walter Frederic (Ah) Waldo M. Wedel John L. Wheeler Arthur R. Machell
28、(Alt) Technical Committee X3B5 on Magnetic Tape Cassettes, which developed this standard, had the following members: Raymond C. Smith, Chairman Bruce Manildi, Secretary Arthur R. Anderson Herbert W. Sallet Robert E. Arko E. Skalko John A. Buchanan Robert Duffy (Ah) J. B. Davis Charles Gould (Ah) Jer
29、e Hill (AR) Raymond C. Smith Mile Floyd Douglas H. Cameron (Ah) Doug Strube (Ah) Max Sadowski (Ah) Michael D. Hogan R. A. vonBehren (Ah) Ray Kavlick Robert E. Wolff (Ah) D. Nelson (Ah) Richard T. Steinbrenner Bruce Manildi Noel A. Leifer (Alt) George W. Bowers (Ah) James E. Williams (Ah) James McCoy
30、 (Ah) Ronald M. Vroblick Robert N. Miller Azmi Audeh (Ah) David Mills (Ah) Glen Williams William B. Poland, Jr Gary Kroggel (Ah) Joseph Pomian J. S. Zajaczkowski Hakan Hemdal (Alt) D. Fowler (Ah) Donald 0. Rasmussen Vaughn J. Jenkins (AR) Russell Bartholomew (Ah) V. L. Thompson (Ah) Contents SECT1oN
31、 PAGE 1. Scope and Introduction . 7 1.1 Scope 7 1.2 Introduction . 7 2. Definitions 7 2.1 Magnetic Tape Cartridge. 7 2.2 Flux Reversal. . 8 2.3 Densy 8 2.4 Recorded Block 8 2.5 Data Block. . 8 2.6 InitialGap 8 2.7 Interblock Gap . 8 2.8 InContact 8 2.9 Control Block (Tape Mark) . 8 2.10 Preamble . 8
32、 2.11 Postamble 8 2.12 Cyclic Redundancy Check (CRC) Character 8 2.13 Beginning of Tape (BOT) Marker . 8 2.14 End of Tape (EOT) Marker. 8 2.15 Load Point (LP) Marker . 8 2.16 Early Warning (EW) Marker. 8 2.17 Amplitude Reference Tape . 8 2.18 Standard Reference Current 8 2.19 Standard Reference Ampl
33、itude 8 2.20 Track . 8 2.21 Frame . 8 3. Recording 8 3.1 Method 8 3.2 Equipment 9 3.3 Densy 9 3.4 Flux-Reversal Spacing 9 3.5 Signal Amplitude. . 9 3.6 Erase 9 4. Format 9 4.1 Number of Tracks . 9 4.2 Use of Tracks 9 4.3 Byte and Code Requirements. . 9 4.4 Gaps 10 4.5 Block Length 10 4.6 Control Blo
34、ck (Tape Mark) . 11 4.7 CRC Character . 11 4.8 Usable Recording Area. . 11 5. Revision of American National Standards Referred to in This Document. 11 Figures Fig. 1 Tape Guide and Track Dimensions . 10 Fig. 2 Recorded Block Format . _ . . . . . . . . . . . . . . . . . . . . . _ . . . . . . . . . .
35、. . . . 11 American National Standard Parallel Recorded Magnetic Tape Cartridge for Information Interchange, 4 Track, 0.250 inch (6.30 mm), 1600 bpi (63 bpmm), Phase Encoded 1. Scope and Introduction 1.1 Scope. This American National Standard is in- tended to provide a format and recording standard
36、for a 0.250-inch (6.30-mm) -wide, 4-track magnetic tape in a cartridge to be used for information interchange be- tween information processing systems, communication systems, and associated equipment utilizing the Ameri- can National Standard Code for Information Inter- change, ANSI X3.4-1977 (ASCII
37、). This standard refers solely to recording on 0.250-inch (6.30-mm) magnetic tape cartridges; it complements American National Standard Unrecorded Magnetic Tape Cartridge for In- formation Interchange, 0.250-inch (6.30-mm), 1600 bpi (63 bpmm), Phase Encoded, ANSI X3.55-1977, where the following sect
38、ions are dealt with in detail: general requirements, definitions, tape and cartridge, physical and magnetic requirements, speed require- ments, and write enable feature. Compliance with ANSI X3.55-1977 is a requirement for information interchange. CAUTION: The users attention is called to the possib
39、ility that compliance with this standard may require use of an invention covered by patent rights. By publication of this standard, no position is taken with respect to the validity of this claim or of any patent rights in connection therewith. The patent holder has, however, ffied a statement of wi
40、llingness to grant a license under these rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such a license. Details may be obtained from the publisher. No representation or warranty is made or implied that this is the only license that may be required to
41、 avoid infringement in the use of this standard. 1.2 Introduction 1.2.1 This standard defines the requirements and supporting test methods necessary to ensure interchange at acceptable performance levels It is distinct from a specification in that it delineates a minimum of restric- tions consistent
42、 with compatibility in interchange trans- actions. 1.2.2 The performance levels in this standard rep- resent the minimum acceptable levels of performance for interchange purposes. They therefore represent the performance levels which the interchanged items should meet or surpass during their useful
43、life and thus define end-of-life criteria for interchange purposes. The per- formance levels in this standard are not intended to be employed as substitutes for purchase specifications. 1.2.3 Wherever feasible, quantitative performance levels that must be met or exceeded in order to com- ply with th
44、is standard are given. In all cases, including those in which quantitative limits for requirements falling within the scope of this standard are not stated but are left up to agreement between interchange par- ties, the test methods and measurement procedures normally used in the industry shall be u
45、sedto deter- mine such limits. 1.2.4 U.S. engineering units are the original dimen- sions in this standard. Conversions of dimensions and tolerances from customary U.S. engineering units to SI units have been made according to Method A as de- scribed in American National Standard Metric Practice, AN
46、SI 2210.1-1976, and Toleranced dimensions - Con- version from inches into millimetres and vice versa, IS0 370-1975, except as noted. Method A should be used for economy unless a requirement for absolute assur- ance of a fit justifies the use of Method B. In the national standards of IS0 member natio
47、ns, additional rounding may have been done to produce “preferred” values. These values should lie within or close to the original tolerance ranges. 1.2.5 Except as indicated in 1.2.3, interchange par- ties complying with the applicable standards should be able to achieve compatibility without any ne
48、ed for additional exchange of technical information. 2. Definitions 2.1 Magnetic Tape Cartridge. A cartridge containing 0.250-inch (6.30-mm) -wide magnetic tape wound on two coplanar hubs with an internal drive belt to move the tape between the hubs. (See Fig. I in ANSI X3.55- 1977.) 7 AMERICAN NATI
49、ONAL STANDARD X3.72-1981 2.2 Flux Reversal. A reversalof flux polarity. The posi- tion of a flux reversal is the point that exhibits the maximum free-space flux density normal to the tape surface. 2.3 Density. The number of data bit flux reversals per unit length of recorded track, exclusive of phase flux reversals, usually expressed in bits per inch (bpi) or bits per millimeter (bpmm). 2.4 Recorded Block. A group of contiguously recorded bits which extend from one interblock gap to the next interblock gap. This includes the data bits, CRC, and synchronizing bits such as preamble and
