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1、1.将DX寄存器中的16位数分成4组，分别放在AL，BL,CL,DL中。DATASSEGMENTBLOCKDB0DH,0AH,'DL=','$'BLOCK1DB0DH,0AH,'CL=','$'BLOCK2DB0DH,0AH,'BL=','$'BLOCK3DB0DH,0AH,'AL=','$'ADB?BDB?BUFFDB?;此处输入数据段代码DATASENDSCODESSEGMENTASSUMECS:CODES,DS:DATASSTART:MOVAX,DATASMOVDS,AXMOVAX,1234HANDAX,0F0F0HMOVCL,4SHRAX,CLMOVAL,AHMOVBUFF,
2、ALLEADX,BLOCK3MOVAH,9INT21HADDBUFF,30HMOVDL,BUFFMOVAH,2INT21H;显示ALMOVDX,1234HMOVAX,DXANDAX,0F0FHMOVBL,AHLEADX,BLOCK2MOVAH,9INT21HADDBL,30HMOVDL,BLMOVAH,2INT21H;显示BLMOVAX,1234HANDAX,0F0F0HMOVCL,4SHRAX,CLMOVCL,ALMOVB,CLLEADX,BLOCK1MOVAH,9INT21HADDB,30HMOVDL,BMOVAH,2INT21HXORCL,CL;显示CLMOVAX,1234HA
3、NDAX,0F0FHMOVDL,ALMOVA,DLLEADX,BLOCKMOVAH,9INT21HADDA,30HMOVDL,AMOVAH,2INT21H;显示DL;此处输入代码段代码MOVAH,4CHINT21HCODESENDSENDSTART2.在内存单元BCD中的2位压缩BCD码转换成ASCⅡ码，并存入BUFF和BUFF+1单元，并显示出来。（提示：显示低4位BCD码的方法为取出该数，屏蔽高4位，再与30H相加，存入BUFF单元，再显示高4位的BCD码，方法为取出该数，右移4位，与30H相加，存入BUFF+1单元。）DATASSEGMENTBCDDB0ABHBUFFDB?DA
4、TASENDSCODESSEGMENTASSUMECS:CODES,DS:DATASSTART:MOVAX,DATASMOVDS,AXMOVDL,BCDANDDL,0FHLEABX,BUFFMOV[BX],DLADDBUFF,30HMOVDL,BUFFMOVAH,2INT21HMOVAL,BCDMOVCL,4SHRAL,CLMOV[BX+1],ALADDBUFF+1,30HMOVDL,BUFF+1MOVAH,2INT21H;此处输入代码段代码MOVAH,4CHINT21HCODESENDSENDSTART
