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1、多字节加/减程序实验 通信１班 李耀东 ２３３２０１１２２０４１２８一．实验目的（1）掌握多字节二进制，BCD码加减运算程序的编程方法；（2）掌握多字节二进制，BCD码加减运算程序的调试方法；（3）掌握循环程序的编程方法；（4）了解调试程序的选区原则；（5）熟练掌握DEBUG中D,E,A,G等命令的使用。二．实验内容（1）二进制加法78563412+FODEBC9A=016934F0ACCCDDEEFF+8899AABB=01557799BA（2）多字节压缩型BCD码的加法568686
2、56+34654387=9152304387645425+76656522=0164301947（3）多字节非压缩型BCD码的加法08050607+08030704=010609040105020403+02080602=08010005（4）DATASEGMENTDATA1DB4DUP(?)DATA2DB4DUP(?)DATA3DB5DUP(?)DATAENDSCODESEGMENTASSUMECS:CODE,DS:DATASTART:MOVAX,DATAMOVDS,AXMOVSI,OFFSE
3、TDATA1MOVCX,DATA2-DATA1CLCNEXT:MOVAL,[SI]ADCAL,[SI+DATA2]NOPMOV[SI+DATA3],ALINCSILOOPNEXTMOVAL,0ADCAL,0MOV[SI+DATA3],ALMOVAH,4CHINT21HCODEENDSENDSTART（1）将上述DATASEGMENTDATA1DB4DUP(?)DATA2DB4DUP(?)DATA3DB5DUP(?)DATAENDS改为DATASEGMENTDATA1DB8DUP(?)DATA2D
4、B8DUP(?)DATA3DB9DUP(?)DATAENDS（6）DATASEGMENTDATA1DW4DUP(?)DATA2DW4DUP(?)DATA3DW5DUP(?)DATAENDSCODESEGMENTASSUMECS:CODE,DS:DATASTART:MOVAX,DATAMOVDS,AXMOVSI,OFFSETDATA1MOVDI,OFFSETDATA2MOVBX,OFFSETDATA3MOVCX,(DATA2-DATA1)/2CLCNEXT:MOVAX,[SI]ADCAX,[DI]
5、NOPMOV[BX],AXINCSIINCDIINCBXINCSIINCDIINCBXLOOPNEXTMOVAL,0ADCAL,0MOV[BX],ALMOVAH,4CHINT21HCODEENDSENDSTART一．选择实验（1）要改为多字节二进制减法程序，则将ADC指令改为SBB指令即可：修改为多字节压缩型，非压缩型BCD码减法程序只需将NOP指令改为DAS和AAS。这里就不再附上程序了。（2）DATASEGMENTDATA1DB8DUP(?)DATA2DB4DUP(?)DATA3DB9DUP
6、(?)DATAENDSCODESEGMENTASSUMECS:CODE,DS:DATASTART:MOVAX,DATAMOVDS,AXMOVSI,OFFSETDATA1MOVDI,OFFSETDATA2MOVBX,OFFSETDATA3MOVCX,DATA3-DATA2CLCNEXT:MOVAL,[SI]ADCAL,[DI]NOPMOV[BX],ALINCSIINCDIINCBXLOOPNEXTMOVCX,4NEXT1:MOVAL,0ADCAL,[SI]MOV[BX],ALINCSIINCBXL
7、OOPNEXT1MOVAL,0ADCAL,0MOV[BX],ALMOVAH,4CHINT21HCODEENDSENDSTART调试数据：FFFFFFFF78563412+AAEEDDBC=0100000000234511CEFEFFFFFF76544334+CBAFCDBF=FF000000420410F3（3）DATASEGMENTDATA1DB4DUP(?)DATA2DB4DUP(?)DATA3DB6DUP(?)DATAENDSCODESEGMENTASSUMECS:CODE,DS:DATA
8、START:MOVAX,DATAMOVDS,AXMOVSI,OFFSETDATA1MOVDI,OFFSETDATA2MOVBX,OFFSETDATA3MOVCX,DATA2-DATA1CLCNEXT:MOVAL,[SI]ADCAL,[DI]NOPMOV[BX],ALMOV[DI],ALINCSIINCDIINCBXLOOPNEXTMOVCL,2NEXT1:MOVAL,0ADCAL,[BX]MOV[BX],ALINCBXLOOPNEXT1MOVAH,4CHINT21HCODEENDSENDSTAR
