This standard outlines the principles that should be followed in the configuration of the control key area on numeric keyboards, alphanumeric keyboards and composite keyboards relative to the "center of the keyboard". Taking into account the frequency of use of each key function action, this standard proposes criteria for assigning control functions to each key, and also describes other relevant characteristics that affect the allocation of control functions and gives appropriate considerations. GB/T 4872-1985 Principles for the positioning of control keys on keyboards of office machines and data processing equipment GB/T4872-1985 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Office machines and data processing equipment
Principles for positioning control keys on keyboards
UDC681.61.065.1
GB 4872—B5
1.1This standard outlines the principles that should be followed in the configuration of the control key area on numeric keyboards, alphanumeric keyboards and composite keyboards relative to the "center of the keyboard". Taking into account the degree of use of each key function action, this standard proposes the criteria for assigning control functions to each key, and also describes other relevant characteristics that affect the allocation of control functions and gives appropriate considerations. 1.2 This standard should be used in conjunction with GB2787-81 "Layout of the alphanumeric area of ​​keyboards for seven-bit coded character sets for information processing interchange" and Appendix A of this standard "Office machines and data processing equipment - Keyboard layout for digital applications" as the basis for determining the entire keyboard layout of a numeric or alphanumeric machine.
1.3 This standard does not provide criteria when the positioning of control functions is obtained by additional shift operations on the "center" key. 1.4 The control keys on numeric keyboards, alphanumeric keyboards and composite keyboards may be outside the "center" area or superimposed on the "center" area, or a combination of the two.
1.5 This standard refers to the international standard ISO3244-84 "Office machines and data processing equipment - Principles for the positioning of control keys on keyboards".
2 Keyboard layout
2.1 Numeric plate layout
This layout includes 10 numeric parts and a number of optional keys for additional characters and some corresponding control keys. 2.2 Alphanumeric keyboard layout
This layout includes an alphanumeric part designed for two-handed operation and a number of corresponding control keys. 2.# Alphanumeric and numeric composite keyboard layout This layout combines the numeric and alphanumeric parts and the corresponding control keys for each part. Keyboard layouts in which the numeric group overlaps the numeric part are not included in this standard. 2.4 Explanation of Figures
Figures 1, 2, and 3 are schematic diagrams of the above three types of layouts. These schematic diagrams are only used to indicate the basic relative positions of the relevant areas, without determining their size or shape, nor specifying the number of keys contained in each area. The classification of special equipment and machines is not included in this standard.
3 Control keys that may be required on the keyboard
3.1 Operate simultaneously with the "center" character to complete local functional operations, such as positioning, format editing, etc. 3.2 Operate simultaneously with the "center" character to achieve the following functional operations. Long-distance communication through data transmission channels: b. Data exchange through media:
National Bureau of Standards 198501-17 issued
1986-07-01 implementation
GB 48T2-85
Core, processing system internal data transmission. 3.3 Complete local functions on a machine of which the keyboard is a component without interfering with other functions that the machine can complete. 4 Principles to be followed by keyboard control keys
Frequency of use or operation
Frequency of use or operation is the main criterion for assigning control functions to each key. 4.2 Occurrence frequency
In 4.1, the meaning of "frequency of use or operation" refers to the number of times the control is used. A further factor to be considered is the frequency of special controls specified for a certain type of equipment, which can be considered as the frequency of occurrence of the control. For example: one control may occur on all keyboards of a certain model of machine, while another control can only occur at certain times. If controls are located strictly according to frequency of operation, then in the example cited, the same keyboard position can be allocated to the most frequently used control. bzxZ.net
It can also be considered that in certain cases, it may be best to provide a fixed position for the most frequently used control, even if some infrequently used controls are likely to be the most frequently operated controls. 4.3 Traditional placement
Some control keys, such as the space bar on a typewriter or calculator, are usually placed in a standard position and should not be changed at will in principle. 4.4 Method of operation
The location of control keys is constrained by their method of use, especially when two control keys must be used together or a control key must be used in conjunction with another key, then they should not be placed in a position determined by their frequency of occurrence or frequency of use. 5 Allocation of control areas on the keyboard
The criteria for allocating control functions to keys outside the "center" area are already described in Chapter 4. When determining the control area, the following details should be checked:
Numeric Keypad
The keys on the numeric keypad are usually operated from the left to the right with the right hand, so it is desirable to place the control keys that are operated frequently on the right side of the numeric area.
b. Alphanumeric Keypad
The alphanumeric keypad is operated with both hands, so it is desirable to place the control keys that are operated frequently on both sides of the alphanumeric area. If it is necessary to place more frequently operated control keys on one side of the keyboard than on the other side, it is recommended to place more on the right side of the keyboard. c. Alphanumeric and Numeric Composite Keypad
The alphanumeric and numeric composite keyboard is considered to be a combination of alphanumeric and numeric keyboards. Therefore, the allocation of control keys will be a combination of items a and b above. Control keys that are more closely related to the numeric area should be placed on the right side of the numeric area, and control keys that are more closely related to the alphanumeric area should be placed on both sides of the alphanumeric area. 5.1 Numeric Keypad
The control area of ​​the numeric keypad shall consist of two partitions (see Figure 1): Partition A1 is to the right of the numeric area
b. Partition B2 extends to the left and above the numeric area. The control functions that are frequently used during operation should be assigned to the keys in the Z1 partition (subject to the restrictions of Chapter 4). Other control functions can be assigned to the keys in the Z1 and/or Z2 partitions. 5.2 Alphanumeric keyboards
The control area of ​​the alphanumeric keyboard should include two partitions (see Figure 2): a. Z3 partition to the right and left of the alphanumeric area; b. Z4 partition can extend to the left and above the alphanumeric area. The control functions that are frequently used during operation should be assigned to the keys in the Z3 partition (subject to the restrictions of Chapter 4). Other control functions can be assigned to the keys in the Z3 and/or Z4 partitions. 5.3 Alphanumeric and numeric composite keyboards (see Figure a) The composite keyboard is a combination of the keyboards described in 5.1 and 5.2, with the numeric part being placed to the right of the alphanumeric area. The control area thus comprises the four zones Z1 to Z4 described above. Zones Z2 and Z3 are arranged side by side and appear to be separate zones, but from a functional point of view they can still be considered separate. Control functions that are frequently used during the operation of the alphanumeric portion should be assigned to the keys of zone Z3 (subject to the restrictions of Chapter 4). Control functions that are frequently used during the operation of the numeric portion should be assigned to the keys of zone Z1.
Control functions that are frequently used during the operation of both zones may be repeated in both zones or, preferably, assigned to the keys of the zone that is most accessible to both zones, i.e., part of zone Z3 to the right of the alphanumeric zone or part of zone 22 to the left of the numeric zone. The remaining control functions may be assigned to the keys of zones Z1, Z2, Z3 and/or Z4. 5.4 Additional considerations for zones Z1 and Z3 Zones Z1 and Z3 have been designed to contain the most frequently used controls associated with the numeric and alphanumeric keyboards, respectively. In addition, the following considerations apply to these zones.
5.4.1 For Z1 Division
8: Most frequently used controls
The most frequently used controls shall be placed to the right of the lower row of letters and may extend to the right and/or downward and/or upward. b. The second most frequently used controls
The second most frequently used controls shall be placed above the most frequently used controls. c. Other frequently used controls
Other frequently used controls shall be placed in the remainder of this division. 5.4.2 For Z3 Division
E. Most frequently used controls
The most frequently used controls shall be placed to the right of the middle row of letters and may extend downward and/or upward. b. The second most frequently used controls
The second most frequently used controls, if placed to the right, shall be placed above the most frequently used controls. c. Other frequently used controls
Other frequently used controls shall be placed in the remainder of this division. 5.4.3 For Z1-1-Z3 partitions
Control keys located in any of these two partitions should not be affected by the "Shift" key operation. z2
GB 4872-85
GB 4872--85
Appendix A
Office machines and data processing equipment
Keyboard layout for digital applications
(reference)
A.1.1 This appendix specifies the basic layout of numbers and symbols on the keyboard. The keyboard is suitable for occasions where the data is digital. A.1.2 This appendix applies to keyboards used in office machines and data processing equipment, and does not apply to alphanumeric keyboards with special number combinations.
A.1.8 This appendix is ​​equivalent to the international standard ISO3791-76 "Office machines and data processing equipment-Keyboard layout for digital applications".
A.2 Layout
The keyboard consists of the following three parts
a: a three-key three-row array, assigned to the numbers 1 to 9, b. a zero/decimal point area,
center. Additional optional keys.
A.2.1 Numbers
The numbers 1 to 9 are assigned to the three-key three-row array in sequence, as shown in Figure A1. Figure A1
GB4872—85
A.2.2 Zero/decimal point area
The zero/decimal point area is below the three-key three-row array. It can be extended to the left and upward, as shown in Figure A2. Figure A2
The number zero should be placed in the zero/decimal point area, which should include the following three situations: a single key that produces zero, or two keys that produce zero and double zero respectively; or a blue key that produces zero, double zero, and triple zero respectively, as shown in Figure A3. However, whether the key that produces a single zero is a large block key or a small block key, it must be placed on the derivative of A51. Note: When the zero/decimal point area includes two or three keys, that is, zero and double zero or zero, double zero and triple zero, the relative sizes of the two keys or one key may not be as shown in the configuration shown in Figure A3.
A.2.8 Additional keys
When special applications require optional characters, they can be allocated on each additional key L according to the provisions of A.2.3.1, A.2.3.2 and A.2.3.3. A.2.a.1 "Decimal point" character
When the "decimal point" character is required, it can only be placed at the rightmost end of the zero/decimal point area, as shown in Figure A4. The triple zero character and the decimal point character cannot appear in the same layout because they are allocated in the same position. A.2.a.2 "Space" character (SP)
GB4872—85
When a "space" character is needed, it should be placed on the key to the right of the zero/decimal point area, that is, occupying the A54 area and can be extended to the left or upward, as shown in Figure A5.
A.2.3.3 "Minus" character (-)
When a "minus" character is needed, it should be placed on the left of the three-key three-row array, that is, occupying the C50 area and can be extended upward, as shown in Figure A6.
GB 48T2—a6
Note: The "minus" character key specified in this standard is only used as a character key for display and printing, and should not be confused with the "minus" character key for performing subtraction operations. Note:
This standard was proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard was reviewed and approved by the National Technical Committee for Computer and Information Processing Standardization and the "Peripheral Equipment, Office Machines and Consumables" Subcommittee of the Committee.
This standard was drafted by Factory 734 of the Ministry of Electronics Industry. The main drafters of this standard were Zhou Qingyun, Gong Tingfan, Tao Liusheng, and Wang Lijian.
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