47. 二、ASCII码──美国标准信息交换代码(American Standard Code for Information Interchange)要求记住0~9、A~F的ASCII码高3位 MSDb6b5b4低4位01234567LSDb3b2b1b000000101001110010111011100000NULDLESP0@P`p10001SOHDC1!1AQaq20010STXDC2"2BRbr30011ETXDC3#3CScs40100EOTDC4$4DTdt50101ENQNAK%5EUeu60110ACKSYN&6FVfv70111BELETB'7GWgw81000BSCAN(8HXhx91001HTEM)9IYiyA1010LFSUB*:JZjzB1011VTESC+;K[k{C1100FFFS,N n~F1111SIUS/?O oDEL47