袖珍电子计算器配以一定的输入/输出接口加以扩展应用,就可作为一种自动运算和逻辑控制部件,国内国外都已有不少报导.袖珍计算器成本低、方便灵活、可靠性好、准确度高、功能较齐全,在目前国内数字集成电路还不是相当普及的情况下,有一定的推广价值.但是国内袖珍计算器的机型繁杂,给它配以一定的输入接口,改装为自动输入信息时,往往由于输入接口设计不当,使计算器工作不可靠,甚至无法工作.本文从普及推广的角度出发,介绍如何根据不同的计算器机型,设计输入接口电路,并给出选择计算器时要注意的几个实用参数的简易粗测法.目前大多数计算器的数据打入方式基本相同,都由键盘通过矩阵扫描方式输入.当键盘将矩阵开关的某两点接通,就会启动计算器相应的微程序,执行该键输入的功能.例如PG-1200计算器的键盘输入有三 Pocket electronic calculators with a certain number of input / output interface to be extended applications, can be used as an automatic computing and logic control components, there have been many reports at home and abroad. Pocket calculator low cost, convenient and flexible, good reliability, High accuracy, complete functions, in the current domestic digital integrated circuit is not quite popular case, there is a certain promotional value.However, the pocket calculator complexity of the domestic models, it is accompanied by a certain amount of input interface, converted to automatic When inputting information, it often causes the calculator to work unreliable or even unable to work due to the improper design of the input interface.This paper introduces how to design the input interface circuit according to different calculator models from the perspective of popularization and popularization, When you want to pay attention to several practical parameters of the simple rough test.At present, most of the calculator data into the same way, all by the keyboard through the matrix scan mode input.When the keyboard will switch matrix two points on Will start the calculator corresponding micro program, the implementation of the key input function. For example, the PG-1200 calculator keyboard input has three