南京邮电大学微机接口第一二次实验

1.1程序修改;FILENAME:EXA131.ASM.486DATASEGMENTUSE16SUMDB?,?MESGDB'25+9='DB0,0,'$'N1DB9,0F0HN2db25dataENDSCODESEGMENTUSE16ASSUMECS:CODE,DS:DATABEG:MOVAX,DATAMOVDS,AXMOVBX,OFFSETSUMMOVAH,N1MOVAL,N2ADDAH,ALMOV[BX],AHCALLCHANGMOVAH,9MOVDX,OFFSETmesgINT21HMOVAH,4CHINT21HchangPROCLAST:CMPbyteptr[BX],10JCNEXTSUBbyteptr[BX],10INCbyteptr[BX+7]JMPLASTNEXT:movdx,wordptrsumADD[BX+8],dxADDbyteptr[BX+7],30HADDbyteptr[BX+8],30HretchangendpCODEENDSENDBEG2.1学生成绩;FILENAMEEXA241.ASM.486DATASEGMENTUSE16NEQU10SCOREDB43,51,61,71,75,82,86,92,99,100S5DB0S6DB0S7DB0S8DB0S9DB0S10DB0MESG1DB'S5(0-59):','$'MESG2DB'S6(60-69):','$'MESG3DB'S7(70-79):','$'MESG4DB'S8(80-89):','$'MESG5DB'S9(90-99):','$'MESG6DB'S10(100):','$'DATAENDSCODESEGMENTUSE16ASSUMECS:CODE,DS:DATABEG:MOVAX,DATAMOVDS,AXMOVAH,00H;MOVAL,3;INT10H;前面三行可以去掉不影响运行MOVCX,NANDCX,00FFHMOVBX,OFFSETSCORECOUNT:CMPBYTEPTR[BX],59JNACOUNT1CMPBYTEPTR[BX],69JNACOUNT2CMPBYTEPTR[BX],79JNACOUNT3CMPBYTEPTR[BX],89JNACOUNT4CMPBYTEPTR[BX],99JNACOUNT5INCS10JMPSHORTNEXTCOUNT1PROCINCS5INCBXJMPSHORTNEXTCOUNT1ENDPCOUNT2PROCINCS6INCBXJMPSHORTNEXTCOUNT2ENDPCOUNT3PROCINCS7INCBXJMPSHORTNEXTCOUNT3ENDPCOUNT4PROCINCS8INCBXJMPSHORTNEXTCOUNT4ENDPCOUNT5PROCINCS9INCBXJMPSHORTNEXTCOUNT5ENDPNEXT:LOOPCOUNTMOVAH,09HMOVDX,OFFSETMESG1INT21HMOVAH,02HMOVDL,30HADDDL,S5INT21HMOVAH,09HLEADX,MESG2INT21HMOVAH,02HMOVDL,30HADDDL,S6INT21HMOVAH,09HLEADX,MESG3INT21HMOVAH,02HMOVDL,30HADDDL,S7INT21HMOVAH,09HLEADX,MESG4INT21HMOVAH,02HMOVDL,30HADDDL,S8INT21HMOVAH,09HLEADX,MESG5INT21HMOVAH,02HMOVDL,30HADDDL,S9INT21HMOVAH,09HLEADX,MESG6INT21HMOVAH,02HMOVDL,30HADDDL,S10INT21HMOVAH,4CHINT21HCODEENDSENDBEG为什么去掉MOVAH,02H语句后就无法输出正确结果(数值就不对)呢？MOVDL,30HADDDL,S10INT21H这三条语句为什么能够把统计的数值给输出出来呢？如是S10：1它是怎么输出的？为什么S10：后就会接着显示1呢？MOVAH,00H;MOVAL,3;INT10H;这三条语句有什么作用？2.2通信字.486DATASEGMENTUSE16BUF1DB'123456'BUF2DB'000000'BUF3DB'Pleaseinputcommunicationwords:',0DH,0AH,'$'BUF4DB3OUT1DB'ERRORS',0DH,0AH,'$'OUT2DB'RIGHT',0DH,0AH,'$'OUT3DB'*','$'OUT4DB0DH,0AH,'$'DATAENDSCODESEGMENTUSE16ASSUMECS:CODE,DS:DATA,ES:DATABEG:MOVAX,DATAMOVDS,AXMOVES,AXMOVAH,00HMOVAL,3INT10HLAST1:LEASI,BUF1LEADI,BUF2MOVBX,OFFSETBUF2MOVCX,6MOVAH,09HLEADX,BUF3INT21HLAST:MOVAH,07HINT21HMOVBYTEPTR[BX],ALINCBXMOVAH,09HMOVDX,OFFSETOUT3INT21HLOOPLASTMOVAH,09HLEADX,OUT4INT21HMOVCX,6CLDREPECMPSBJZEXITMOVAH,09HLEADX,OUT1INT21HDECBUF4JZLAST2