1、BRITISH STANDARD BS 4636-3: 1986 ISO 6586:1980 Punched cards Part 3: Specification for representation of 7-bit and 8-bit coded character sets on12-row punched cards UDC 676.815:681.327.45 BS4636-3:1986 This British Standard, having been prepared under the directionof the Office and Information Stand
2、ards Committee, was published underthe authority of the BoardofBSI and comes into effect on 31 July 1986 BSI 11-1999 First published November 1971 First revision July 1986 The following BSI references relate to the work on this standard: Committee reference IST/2 Draft for comment 79/65454 DC ISBN 0
3、 580 15082 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Office and Information Standards Committee (IST/-) to Technical Committee IST/2, upon which the following bodies were represented: Association for Literary and Linguistic Compu
4、ting British Federation of Printing Machinery and Supplies Ltd. British Radio and Electronic Equipment Manufacturers Association British Telecommunications plc Business Equipment Trade Association Computing Services Association Independent Broadcasting Authority Institution of Electrical Engineers N
5、ational Computing Centre Ltd. PIRA (The Research Association for the Paper and Board, Printing and Packaging Industries) Telecommunication Engineering and Manufacturing Association (TEMA) Amendments issued since publication Amd. No. Date of issue CommentsBS4636-3:1986 BSI 11-1999 i Contents Page Com
6、mittees responsible Inside front cover National foreword ii 1 Scope and field of application 1 2 References 1 3 Punched cards 1 4 Specification 1 Annex 4 Figure Layout of punching positions 2 Table 1 Card-hole-pattern assigned to bit-combinations 3 Table 2 Bit-combinations assigned to card hole patt
7、erns 5 Publications referred to Inside back coverBS4636-3:1986 ii BSI 11-1999 National foreword This Part of BS 4636 has been prepared under the direction of the Office and Information Standards Committee. It is identical to ISO 6586:1980 (confirmed1986) “Data processing Implementation of the ISO 7-
8、bit and 8-bit coded character sets on punched cards” published by the International Organization for Standardization (ISO). ISO 6586:1980 superseded two standards: ISO 1679:1973 “Representation of ISO7-bit coded character set on 12-row punched cards”, which was technically equivalent to BS 4636 “Spe
9、cification for punched cards” Part3:1971 “Representation of 7-bit codes and of certain numerical sets on12-row punched cards”, and ISO 2021:1975 “Representation of 8-bit codes on12-row punched cards”, which was technically equivalent to BS 4636 “Specification for punched cards” Part 4:1971 “Represen
10、tation of 8-bit codes on12-row punched cards”. This revision of BS 4636-3 supersedes both BS 4636-3:1971 and BS 4636-4:1971, which are withdrawn. This standard specifies the card hole patterns assigned to bit combinations, whereas BS 4636-3:1971 and BS 4636-4:1971 were also concerned with the repres
11、entation of particular coded character sets on 12-row punched cards. In the UK, where the 7-bit and 8-bit coded character sets for information interchange are applied, users should exercise the national options specified in BS 4730 and BS 6006 respectively. Terminology and conventions. The text of t
12、he International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. Wherever the words “International Standard
13、” appear, referring to this standard, they should be read as “British Standard”. The Technical Committee has reviewed the provisions of ISO 2022:1982, to which reference is made in the text, and has decided that it is acceptable for use in conjunction with this Part of BS 4636. Additional informatio
14、n. ISO 2022:1982 is currently being revised. Until that revision is published no decision will be made on its implementation as a British Standard. ISO 2022:1982 was not implemented as a British Standard. BS 4953, which was technically equivalent to ISO 2022:1973, has been withdrawn. NOTETypographic
15、al error. In Table 1, at position 04/0, the punched positions should be 8 and 4, not3 and 4. Cross-references International Standard Corresponding British Standard ISO 646:1983 BS 4730:1985 Specification for 7-bit coded character set (Identical exercising national options) BS 4636 Specification for
16、punched cards ISO 1681:1973 Part 1:1970 Unpunched paper cards (Technically equivalent) ISO 1682:1973 Part 2:1970 Dimensions and location of rectangular holes in 12-row, 80-column punched cards (Technically equivalent) ISO 4873:1979 BS 6006:1980 Specification for United Kingdom 8-bit data code (Ident
17、ical)BS4636-3:1986 BSI 11-1999 iii A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summar
18、y of pages This document comprises a front cover, an inside front cover, pages i to iv, pages1to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front c
19、over.iv blankBS4636-3:1986 BSI 11-1999 1 1 Scope and field of application This International Standard defines the implementation of the ISO 7-bit and 8-bit coded character sets on punched cards. It specifies the representation of 7-bit combinations and 8-bit combinations on 12-row punched cards. Thi
20、s representation is derived from, and compatible with, the code known as the “Hollerith Code”. It will ensure compatibility with a large proportion of existing punched card files. This International Standard does not specify any redundancy nor does it define techniques for error control. This Intern
21、ational Standard is intended for the general interchange of information among data processing systems, when using the ISO 7-bit or8-bit coded character sets on 12-row punched cards as data carrier. 2 References ISO 646, 7-bit coded character set for information processing interchange. ISO 1681, Info
22、rmation processing Unpunched paper cards Specification. ISO 1682, Information processing 80 Columns punched paper cards Dimensions and location of rectangular punched holes. ISO 2022, Code extension techniques for use with the ISO 7-bit coded character set 1) . ISO 4873, Information processing 8-bit
23、 coded character set for information interchange. 3 Punched cards 3.1 A punched card, as referred to in this International Standard, is an interchange document in which characters are represented in successive columns, each column having twelve possible punching positions. This International Standar
24、d does not define the number of columns in a card, nor the shape of the holes punched in a card, nor any of its other physical characteristics. The above features are the subject of other International Standards. 3.2 Twelve possible punching positions are available in each column of the card (see Fi
25、gure). For the purpose of this International Standard, they are designated as: 12, 11, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 The hole patterns specified in this International Standard are formed by punching the twelve available positions of a given column of a punched card in the following way: positions 12,
26、 11, 0, 9, 8, may be punched in any combination, giving 2 5= 32 possibilities; only one of the positions 1, 2, 3, 4, 5, 6, 7 may be punched, which together with the NO PUNCH condition gives eight possibilities. These rules provide for 256 hole patterns (32 8). 4 Specification 4.1 Implementation of t
27、he 8-Bit coded character set Table 1 specifies for each of the 256 8-bit combinations the corresponding hole-pattern. The columns and rows are numbered in binary and decimal notation. Each position in Table 1 is identified by its column and row number (for example 06/11) and by the corresponding bit
28、 combination (for example 0110 1011, where the most significant bit is on the left). 4.2 Implementation of the 7-Bit coded character set The hole-patterns shown in the first half of Table 1 (i.e. columns 00 to 07) apply to the 128 7-bit combinations, which are obtained ignoring the most significant
29、eighth bit (b 8 ). 1) At present at the stage of draft. (Revision of ISO 2022:1973.)BS4636-3:1986 2 BSI 11-1999 Figure Layout of punching positionsBS 4636-3:1986 BSI 11-1999 3 Table 1 Card-hole-pattern assigned to bit-combinationsBS4636-3:1986 4 BSI 11-1999 Annex (Not part of the International Stand
30、ard) For ease of reference, and with a view to helping the reader, the correspondence defined in Table 1 between256 8-bit combinations and 256 hole-patterns, is shown hereafter in another form in Table 2. The layout of Table 2 is as follows: the columns, the left half of the rows and the right half
31、of the rows are labelled with card hole-patterns. the entries in the table represent the column/row position of a bit-combination of the 8-bit code table.BS 4636-3:1986 BSI 11-1999 5 Table 2 Bit-combinations assigned to card hole patterns6 blankBS4636-3:1986 BSI 11-1999 Publications referred to See
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