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随着电子计算机的飞跃发展,对其外部设备的要求也愈来愈高,即要求高速化、高可靠性、大容量、低成本和低噪声等。近十几年来,计算机外部设备虽得到了相应的发展,但迄今仍不能适应计算机内处理速度的需要。电子计算机外部设备是人与计算机互相联系进行数据处理的设备,即人—机接口设备。目前,电子计算机外部设备通常分为输入设备、输出设备和外存储设备三大类。输
With the rapid development of electronic computers, the requirements of their external devices are also getting higher and higher, requiring high speed, high reliability, large capacity, low cost and low noise. In the past ten years, the external computer equipment has been developed accordingly, but so far it still can not meet the needs of computer processing speed. The external computer of electronic computer is the equipment that people and computer connect with each other for data processing, namely human-machine interface device. At present, the external computer peripherals are usually divided into input devices, output devices and external storage devices in three categories. lose