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1、BRITISH STANDARD BS 5448:1977 ISO 3791:1976 Specification for Keyboard layouts for numeric applications on office machines and data processing equipment UDC 681.327.11:681.612.065.1:003.35 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 13:15:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5
2、448:1977 This British Standard, having been prepared under the direction of the Office Machines and Equipment Standards Committee and the Data Processing Standards Committee, was published under the authority of the Executive Board on 31 December 1976 BSI 12-1999 The following BSI references relate
3、to the work on this standard: Committee references OMS/3 and DPS/7 Draft for comment 75/61369 ISBN 0 580 09930 X Cooperating organizations The Office Machines and Equipment Standards Committee and the Data Processing Standards Committee, under whose supervision this British Standard was prepared, co
4、nsist of representatives from the following Government departments and scientific and industrial organizations: The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee en
5、trusted with the preparation of this British Standard: AslibHer Majestys Stationery Office* Association of Certified and CorporateHM Customs and Excise AccountantsInstitute of Administrative Management British AirwaysInstitute of Chartered Accountants in England British Bankers Association*and Wales
6、* British Computer Society*Institute of Chartered Secretaries and British Paper and Board Industry FederationAdministrators* (PIF)Institute of Cost and Management British Printing Industry Federation*Accountants Business Equipment Trade Association*Institute of Electrical Engineers Civil Service Dep
7、artment*Institute of Municipal Treasurers and Civil Service Department, Central ComputerAccountants (Incorporated) Agency*Institution of Electrical and Electronics Committee of London Clearing BankersTechnician Engineers Department of the EnvironmentInstitution of Mechanical Engineers Department of
8、the Environment (FireLondon Transport Executive Research Station)Ministry of Defence Department of IndustryNational Coal Board* Drawing Office Material Manufacturers andNational Physical Laboratory, Department of Dealers AssociationIndustry Electricity Supply Industry in England andNational Research
9、 Development Corporation WalesOffice Machines and Equipment Federation* Electronic Engineering AssociationPost Office Engineering Equipment Users AssociationSociety of British Aerospace Companies Government Communications Headquarters British Railways BoardGreater London Council Health and Safety Ex
10、ecutive, HM FactoryRadio and Electronic Component InspectorateManufacturers Federation Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 13:15:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5448:1977 BSI 12-1999i Contents Page
11、Cooperating organizationsInside front cover Forewordii 1Scope1 2Field of application1 3Reference1 4Layout1 Figure 11 Figure 21 Figure 32 Figure 42 Figure 52 Figure 62 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 13:15:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5448:1977 ii BSI 12-199
12、9 Foreword This British Standard is identical with ISO 3791 “Office machines and data processing equipment Keyboard layouts for numeric applications”, which was developed by Subcommittee 14 of Technical Committee 95, Office machines, of the International Organization for Standardization (ISO). Termi
13、nology and conventions. The text of the International Standard has been accepted, as suitable for publication, without deviation, as a British Standard. Certain terminology and conventions are used, however, that are not strictly appropriate in a British Standard, and attention is therefore drawn to
14、 the following. Wherever the words “International Standard”, relating to this publication, appear, they should be interpreted as “British Standard”. The comma has been used throughout as a decimal marker. In British Standards it is current practice to use a full point (a full stop on the baseline) a
15、s the decimal marker. Cross-reference. ISO 1092 referred to in the footnote to 2.2 and clause 3 is expected to be published as a British Standard in the near future. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible
16、for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2 and a back cover. This standard has been updated (see copyright da
17、te) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 13:15:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5448:1977 BSI 12-19991 1 Scope This International Standard specifies th
18、e basic layout of numerals and symbols on keyboards intended to be used in applications where the data are generally numeric. 2 Field of application 2.1 This International Standard is intended for use in establishing complete keyboard layouts for particular machines. It is applicable to both office
19、machines and data processing equipment, and to both numeric and alphanumeric keyboards. It does not apply to alphanumeric keyboards with an in-board numeric cluster. 2.2 The layouts described in this International Standard are concerned only with the nominal relative positions of keys; they are not
20、intended to define physical factors, such as key spacing, keyboard slope, size and shape of keytops, nor the way in which the keytops are inscribed. The definition of such physical factors may be the subject of other International Standards.1) 3 Reference ISO 1092, Adding machines and calculating ma
21、chines Numeric section of ten-key keyboards. 4 Layout A keyboard in accordance with the present International Standard comprises three parts: an array of three rows of three keys, to which the numerals 1 to 9 are allocated; zero/decimal area, additional optional keys. 4.1 Numerals The numerals 1 to
22、9 are allocated to the three rows of three keys in the order shown in Figure 1. NOTETo cover particular requirements, the transposition of the characters allocated to keys B 51, B 52 and B 53 with the characters allocated to keys D 51, D 52 and D 53 respectively is allowed as an option. Other Intern
23、ational Standards may define which alternative is to be used for particular applications.1) 4.2 Zero/decimal area The zero/decimal area is located directly below the three rows of three keys. In accordance with ISO 1092 it may extend to the left and upward as shown in Figure 2. The numeral zero shal
24、l always be allocated to the zero/decimal area. This area may comprise either a single key generating zero, or two keys generating zero and double zero, or three keys generating zero, double zero and triple zero as shown for guidance in Figure 3. In every case, however, all or part of the single zer
25、o key shall be located in position A 51. 1) For application to adding and calculating machines, see ISO 1092. Figure 1 Figure 2 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 13:15:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5448:1977 2 BSI 12-1999 NOTEWhen the zero/decimal area compris
26、es two or three keys (i.e. zero and double zero or zero, double zero and triple zero) the relative sizes of the two or three keys may vary from the schematic arrangement shown in Figure 3. 4.3 Additional keys When required by a particular application, optional characters may be allocated to addition
27、al keys as described in the following clauses. 4.3.1 Character “decimal sign” When the character “decimal sign” is required it can be allocated only to a key situated at the right-hand end of the zero/decimal area as shown in Figure 4. This International Standard does not prescribe the graphical rep
28、resentation of the decimal sign, i.e. a comma or a dot (see C.3.2 of ISO 31-0, General introduction to ISO 31 General principles concerning quantities, units and symbols). NOTEIt shall be noted that the characters triple zero and decimal sign cannot be present simultaneously in the same layout since
29、 they are allocated to the same key position. 4.3.2 Character “space” (SP) When a character “space” is required, it shall be allocated only to a key to the right of the zero/decimal area. This key shall occupy the area A 54 and may extend to the left and/or upward, as shown in Figure 5. 4.3.3 Charac
30、ter “minus” () When the character “minus” is required, it shall be allocated only to the left of the three rows of three keys. This key shall occupy the area C 50 and may extend upward, as shown in Figure 6. NOTEIt shall be noted that the character “minus” key mentioned above is only the display or
31、printing character key and is not to be confused with the “subtract” key which executes a numeric subtract operation. Figure 3 Figure 4 Figure 5 Figure 6 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 13:15:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffi
32、eldun, na, Mon Dec 04 13:15:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5448:1977 ISO 3791:1976 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Eu
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41、rmission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 13:15:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI