图象扫描仪是近年来发展非常快的计算机输入设备，传统的扫描仪与计算机之间通过接口卡连接而不能利用PC上的井口，这种方式已延用多年，其原因主要是由于扫描仪向主机传送的是图象信息，数据量太大，用传统的串口或并口进行通讯速度太慢。常用的接口卡有两种，即ISA接口卡和SC Image scanner is a very fast computer input device developed in recent years. The traditional scanner and computer are connected through interface cards and can not utilize the wellhead on the PC. This method has been extended for many years. The main reason is that the scanner Transfer to the host image information, the amount of data is too large, using the traditional serial or parallel port to communicate too slow. There are two kinds of commonly used interface cards, namely ISA interface card and SC