ISO/IEC INTERNATIONAL 4873 STANDARD Third edition 1991-12-15 Information technology -- IsO 8-bit code for information interchange --- Structure and rules for implementation Technologies de I'information -- Code isO a 8 éléments pour I'échange d'informations -- Structure et regles de materialisation Reference number ISO/IEC 4873:1991(E) Copyright International Organization for Standardization working permitted without license from IHS Not for Resale ISO/IEC 4873:1991 (E) Contents Page 1 1 Scope 1 Conformance and implementation 2 1 Conformance 1 Conformance of information interchange 2.1.1 1 2.1.2 Conformance of devices 2 2.2 Implementation 2 3 Normative references 2 4 Definitions 2 4.1 active position 2 4.2 bit combination 4.3 byte 2 2 4.4 character 2 4.5 character position 2 4.6 coded-character-data-element (CC-data-element) 3 4.7 coded character set 4.8 code extension 3 4.9 code table 3 4.10 control character 3 4.11 control function 3 4.12 device 3 4.13 escape sequence 3 4.14 Final Byte 3 4.15 graphic character 3 4.16 graphic symbol 3 4.17 repertoire 4.18 user 3 3 5 Notation, code table and names 3 5.1 Notation 4 5.2 Code table 4 5.3 Names 4 6 Structure of the 8-bit code 4 6.1 Elements of the 8-bit code 5 6.2 2 Identification of the elements of the 8-bit code @ ISO/IEC 1991 All rights reserved. No pant of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without pemission in writing from the publisher. ISO/IEC Copyright Office : Case postale 56 : CH-1211 Geneve 20 . Switzerland Printed in Switzerland ted without license from IHS Not for Resale ISO/IEC 4873:1991 (E) 6.3 Invocation 5 6.3.1 CO set 5 6.3.2 Character SPACE 5 5 6.3.3 GO set 6.3.4 Character DELETE 5 6.3.5 C1 set5 6.3.6 G1 set 5 G2 set 6.3.7 5 6.3.8 G3 set 5 7 Specification of the characters of the 8-bit code 5 7.1 CO set 6 7.2 Character ESCAPE 6 7.3 Character SPACE 6 7.4 G0 set 6 7.5 Character DELETE 9 7.6 C1 set 9 7.7 G1 set 9 7.8 G2 set 9 7.9 G3 set 10 7.10 Summary of the specification of the 8-bit code 10 8 Levels 10 8.1 Level 1 10 8.2 Level 2 10 8.3 Level 3 11 9 Version of the 8-bit code 11 Contents of a version 11 9.1 9.2 Unique coding of characters 11 10 Identification of version and level 11 10.1 Purpose and context of identification 11 12 10.2 Identification of level 12 10.3 Identification of a version 12 10.4 Switching from one version to another 12 10.5 Switching from one level to another Annexes A Restrictions applicable to the CO and C1 sets 16 Shift functions B 17 18 c Composite graphic characters ili CopyrightInternational Organization for Standardization ited without license from IHS Not for Resale No reproductio