INTERNATIONAL STANDARD

Third edition 1991-12-15 p o h S

- Information technology - IS0 7- coded e

S set for information interchange A ILN a i v Technologies de /‘information - Jew IS0 de caractkes cod& B 7 y p 6kiments pour I’khange d’informations o y l n o w ie v e r P

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1991 : 646

IEC / ISO

-- =E-- E s -z 3 y g 2 f t 3 f I s I. .z Reference number c_-@- G ------e-p- c- ISO/IEC 646: 1991 (E) ISO/IEC 646:1991 (E)

Contents Page

1 Scope 1

2 Conformance and implementation 1 2.1 Conformance 1 2.1.1 Conformance of information interchange 1 2.1.2 Conformance of devices 1 2.2 Implementation 2

3 Normative references 2

p 4 Definitions 2 o h S

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e 4.1 active position

S 4.2 bit combination 2 A 4.3 character 2 ILN 2 a

i 4.4 character position v 2 y 4.5 coded character set p o 4.6 coded-character-data-element(CC-data-element) 3 C

y 3 l 4.7 code extension n

o 3 4.8 code table w 3 ie 4.9 control character v e 3 r 4.10 control function P

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4.11 device 4.12 escapesequence 3 1991 : 4.13 Final 3

646 3 4.14 3

IEC 4.15 graphic

/ . 4.16 repertoire 3 ISO . 4.17 user 3

5 Notation, code table and names 3 5.1 Notation 3 5.2 Code table 4 5.3 Names 4

6 Specification of the coded character set 4 6.1 Structure 4 6.2 Control characters 5

0 ISO/IFc 1991 All rights reserved.No part of this publication may be reproducedor utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in wxiting from the publisher.

ISO/IEC Copyright Of&e l Casepostale 56 l CH-1211 Gen&ve20 l Switzerland I?rintedin switiand

ii ISOLIEC 646:1991 (E)

6.3 Character 6.4 Graphic characters 6.4.1 Unique graphic character allocations 6.4.2 Alternative graphic character allocations 6.4.3 National or application-oriented graphic character allocations 6.5 Character DELETE 8

7 Composite graphic characters 8

8 Versions of the coded character set 8.1 General 8 8.2 International Reference Version (IRV) 9 8.3 National versions 9 8.4 Application-oriented versions 10

p 10 o 9 Identification of versions h S -

e 9.1 Purpose and context of identification 10

S 10 A 9.2 Identification of a version ILN

a 10 Explanation of Code tables No. 4 and No. 5 10 i v y p Annexes o C y l

n A Specification of the CO set 13 o w ie B Guidelines for standards derived from ISO/IEC 646 14 v e r P

- C Differences between the second edition (1983) and the present (third) edition of this International

Standard 15 1991 : 646

IEC / ISO ISO/IEC 646:1991 (E)

Foreword

IS0 (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of IS0 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. IS0 and IEC technical committees p o collaborate in fields of mutual interest. Other international organizations, h S

- governmental and non-governmental, in liaison with IS0 and IEC, also e

S take part in the work. A In the field of information technology, IS0 and IEC have established a ILN

a joint technical committee, ISO/IEC JTC 1. Draft International Standards i v adopted by the joint technical committee are circulated to national bodies y p

o for voting. Publication as an International Standard requires approval by at C least 75 % of the national bodies casting a vote. y l n o

International Standard ISO/IEC 646 was prepared by Joint Technical w Committee ISO/IEC JTC 1, Information technology. ie v e r This third edition cancels and replaces the second edition (IS0 646 : 1983) P

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which has been technically revised. Annexes B 1991 Annex A forms an integral part of this International Standard. : and C are for information only. 646

IEC / ISO