GB/T 4872-1985 in English

《GB/T 4872-1985办公机器和数据处理设备键盘上控制键定位的原则》由TC28（全国信息技术标准化技术委员会）归口，主管部门为国家标准化管理委员会。
本标准概述了数字键盘、字母数字键盘及复合键盘上控制键区相对于“盘心”的配置应遵循的原则。考虑到各键功能动作的使用频度，本标准提出了给各键分配控制功能的准则，还叙述了影响控制功能分配的其他有关特性并给出了适当的考虑。

Scope

This standard outlines the principles that should be followed for the configuration of the control keypads on the numeric keyboard, alphanumeric keyboard and compound keyboard relative to the "center". Taking into account the frequency 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 assignment of control functions and gives appropriate considerations. This standard should be combined with GB2787-81 "Alphanumeric Area Layout of Seven-bit Coded Character Set Keyboard for Information Processing and Interchange" and Appendix A of this standard "Office Machines and Data Processing Equipment--Keyboard Layout for Digital Applications" as a definite number or The basis for the entire keyboard layout of alphanumeric machines. This standard does not provide guidelines when the positioning of the control function is obtained by the "center" key through an additional shift operation. The control keys on the numeric keypad, alphanumeric keypad and compound keyboard can be outside the "center" area or superimposed on the "center" area, or both can be used together. This standard adopts the international standard ISO3244-84 "Office machines and data processing equipment--Principles for the positioning of control keys on the keyboard".