1、INTERNATIONAL STANDARD 3791 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .MEPflYHAPOI,HAR OPrAHU3AUHR IlO CTAHAFTH3AUHH.ORGANISATION INTERNATIONALE DE NORMALISATION Office machines and data processing equipment - Keyboard layouts for numeric applications Machines de bureau et machines employkes en
2、 traitement de Iinformation - Disposition des claviers concus pour des applications numkiques First edition - 1976-08-01 u UDC 651.2 : 681.32-51 (D Ref. No. IS0 3791-1976 (E) 6 T G Descriptors : office machines, data processing equipment, auxiliary equipment (computers), keyboards, numeric character
3、 sets, position they are not intended to define physical factors, such s key spacing, keyboard slope, size and shape of keytops, lror the way in which the keytops are inscribed. The definition of such physical factors may be the subject of other International Standards.) 3 REFERENCE IS0 1092, Adding
4、 machines and calculating machines - 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 numerals 1 to 9 are allocated; - zero/decimal area, - additional optional keys. 4.1 Numerals three
5、keys, to which the The numerals 1 to 9 are allocated to the three rows of three keys in the order shown in figure 1. , 51 I 52 I 53 I FIGURE 1 NOTE - To 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
6、, D 52 and D 53 respectively is allowed as an option. Other International Standards may define which alternative is to be used for particular applications. ) 1) For application to adding and calculating machines, see IS0 1092. 1 Copyright American National Standards Institute Provided by IHS under l
7、icense with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 3791-1976 (E) 4.2 Zero/decimal area The zero/decimal area is located directly below the three rows of three keys. In accordance with IS0 1092 it may extend to the left and upward as shown in figure
8、 2. 4.3.1 Character “decimal sign I 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 representation of the decimal sign, i.e. a co
9、mma or a dot (see C.3.2 of IS0 3 1 /O, General introduction to IS0 3 1 - General principles concerning quantities, units and symbols). D 5o c ElmI B . . . . . . . .*.*.*.*.*.*. :. . . . . . . . . . . . . .:.:, . . . . . . . . . . . . . . . . . :. .*.*.*.*.*.* l.e.*.e.*.*.* :. .:.:.:.:. . . . A :. FI
10、GURE 2 The numeral zero shall 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,
11、all or part of the single zero key shall be located in position A 51. / FIGURE 3 NOTE - When the zero/decimal area comprises two oc 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
12、 figure 3. 4.3 Additional keys When required by a particular application, optional characters may be allocated to additional keys as described in the following clauses. I 50 I 51 , 52 , 53 FIGURE 4 NOTE - It shall be noted that the characters triple zero and decimal sign cannot be present simultaneo
13、usly in the same layout since 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 sh
14、own in figure 5. D C B A 50 yg 54 BB 7. . . . . . . . . . g$pJ , :.:. *:. :. : - - . . . . . . . . . . . . . . , . . . . . . . *.*.*.*. *.*.*.*.*.*. .*.*.*.*.*.*. . . . . . . . . . . . . . . . . . . . . . . : . . . . . . :. :. : *:. . . . . . . , : . . . . . . . . . . . . . :. : , . . . . . . SP . .
15、 . . . . : :. :. : : . . . . . . .*.*.*. . . :. :. : . . . :. :. :. : J FIGURE 5 2 Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 3791-1978 (E) 4.3.3 Character “minus” (-1 W
16、hen 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 up- ward, as shown in figure 6. NOTE - It shall be noted that the character “minus” key mentioned above is only the display or printing character key and is not to be confused with the “subtract” key which executes a numeric subtract operation. FIGURE 6 3 Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
