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1.前言在信息处理中,输入输出设备的作用,虽然没有处理设备那样引人注目,但输入输出设备是一个与用户接触最多、对系统使用方便与否具有重大影响的部分。因此,随着数据处理技术的高度发展,用户就更加关心这个部分,并提出了各种各样的要求。这种情况在市场上已开始表现出来。到第二代计算机为止,计算机的主机和外围设备之间的成本比例为3:1,但是从六十年代后期开始的第三代计算机中已经变为1:1,而从七十年代后期开始,这个比例就开始倒过来了。输入输出设备和终端设备,不仅市场规模大,种类多,而且分类方法也还未确定。这是由于技术进步快,使用范围正在急剧地扩大的
1. INTRODUCTION The role of I / O devices in information processing, while not as noticeable as processing devices, is that I / O devices have a significant impact on the user and ease of use of the system. Therefore, as the data processing technology is highly developed, users are more concerned with this part and put forward various requirements. This situation has begun to show in the market. By the second generation of computers, the cost ratio between the computer’s mainframe and its peripherals was 3: 1, but the third generation of computers, which started in the late 1960s, has changed to 1: 1, and since the late 1970s , This ratio began to reverse. Input and output devices and terminal equipment, not only the market size, variety, and the classification method has not been determined. This is due to the rapid technological progress and the scope of use is rapidly expanding