目前外围设备有何特点?
(1)品种繁多:有机械式的、电子式的、机电式的、磁电式的以及充电式的;(2)处理信息多种多样:有数字信号、模拟信号、开关信号、电压信号或电流信号等;(3)工作速度:不慢速、有的速度甚快,不同的外围设备处理信息的速度相差悬殊;(4)其他:信息格式、电平高低等多种多样。
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