不需要定义数据段。输入小写字母,会显示大写。输入其它字符,忽略。按Esc键退出程序。CODESEGMENTASSUMECS:CODESTART:MOVAH,8INT21HCMPAL,1BHJEEXITCMPAL,61HJLSTARTCMPAL,7AHJGSTARTSUBAL,20HMOVDL,ALMOVAH,2INT21HJMPSTARTEXIT:MOVAH,4CHINT21HCODEENDSENDSTART