键盘显示终端是六十年代以来发展起来的一种电子计算机外部设备。它将计算机的计算能力和人的判断能力、图形识别能力有机地结合起来。用户可以通过显示终端的键盘向计算机输入信息和命令,而显示终端又能把计算机处理过程中的数据和处理结果用 Keyboard display terminal is developed since the sixties of a computer peripherals. It combines the computational power of computer with human judgment ability and graphics recognition ability. The user can input information and commands to the computer through the keyboard of the display terminal, and the display terminal can use the data and the processing result in the computer process