微機(jī)原理第一次實(shí)驗(yàn)講解

CODESEGMENT實(shí)驗(yàn)一順序程序的設(shè)計(jì)令系統(tǒng)中一些基本指令的用法和程序設(shè)計(jì)的的基本方法1.a=09,b=06,c=04,d=072.a=38,b=41,c=29,d=343.a=70,b=23,c=42,d=414.a=63,b=73,c=62,d=50DATASEGMENTNUMDB13H,27H,11H,12HY1DB?DATAENDSSTACKSEGMENTDB20DUP(?)STACKENDSASSUMECS:CODE,DS:DATA,SS:STACKSTART:MOVAX,DATAMOVDS,AXMOVAX,STACKMOVSS,AXMOVAL,NUMADDAL,NUM+1;把a(bǔ)+b的結(jié)果保存在AL中DAA;BCD碼調(diào)整MOVCL,AL;把a(bǔ)+b的結(jié)果復(fù)制到CL中MOVAL,NUM+2ADDAL,NUM+3;把c+d的結(jié)果保存在AL中SUBCL,ALMOVAL,CLMOVY1,ALMOVBL,ALMOVCL,4RORAL,CLANDAL,0FHADDAL,30HMOVDL,AL;BCD碼調(diào)整;把(a+b)-(c+d)的結(jié)果保存在CL中;減法BCD碼調(diào)整;結(jié)果保存于YI中;保存AL中的內(nèi)容;取AL中的高四位;轉(zhuǎn)換為ASCII碼MOVAH,02HINT21HMOVAL,BLANDAL,0FHADDAL,30HMOVDL,ALMOVAH,02HINT21HMOVAH,4CHINT21HCODEENDSENDSTART;顯示高位ASCII碼;恢復(fù)AL的內(nèi)容;取低四位;轉(zhuǎn)換為ASCII碼;顯示高位ASCII碼2.查看初始時寄存器與內(nèi)存中的內(nèi)容Acd7.在40H設(shè)置斷點(diǎn)，得到輸出結(jié)果da=63,b=73,c=62,d=50實(shí)驗(yàn)一思考題cdababcd與期望相同；還將斷點(diǎn)設(shè)置在每一位的顯示后以觀察是否正常顯示。3.a=90,b=34,c=33,d=44a=12,b=19,c=25,d=33與預(yù)期結(jié)果-27不符現(xiàn)考慮結(jié)果為負(fù)數(shù)的情況，同時考慮是否存在百位，改進(jìn)程序如下：DSEGSEGMENTNUMDB12H,19H,25H,33HY1DB?DSEGENDSSSEGSEGMENTPARASTACKDB20DUP(?)SSEGENDSCSEGSEGMENTASSUMECS:CSEG,DS:DSEG,SS:SSEGSTART:MOVAX,DSEGMOVDS,AXMOVAX,SSEGMOVSS,AXMOVAL,[NUM]ADDAL,[NUM+1]MOVCL,ALMOVAL,[NUM+2]ADDAL,[NUM+3]CMPCL,ALJLLLOWSUBCL,ALMOVAL,CLJMPDONE;如果CL<AL跳轉(zhuǎn)，即結(jié)果為負(fù)LLOWSUBAL,CLMOVBL,ALMOVDL,'-'MOVAH,02HINT21HXORDL,DLMOVAL,BLXORBL,BLJMPDONEDONE:MOV[NUM+4],ALMOVBL,ALANDAL,0F0HMOVCL,4SHRAL,CLADDAL,30HMOVDL,ALMOVAH,02HINT21HMOVAL,BL;輸出負(fù)號ANDAL,0FHADDAL,30HMOVDL,ALMOVAH,02HINT21HMOVAX,4C00HINT21HCSEGENDSENDSTART實(shí)驗(yàn)二分支程序的設(shè)計(jì)。CRLFMACROMOVAH,02HMOVDL,0DHINT21HMOVAH,02HMOVDL,0AHINT21HMDATASEGMENTMESS1DB'INPUTDATA:',0DH,0AH,'$'MESS2DB'THISDATAIS+',0DH,0AH,'$';定義宏;顯示回車;顯示回車;宏結(jié)束MESS3DB'THISDATAIS-',0DH,0AH,'$'MESS4DB'THISDATAISZERO',0DH,0AH,'$';定義的結(jié)果信息DATABUFDB3ACTIONDB?STRINGDB3DUP(?)DATAENDSSSEGSEGMENTPARASTACK'STACK'DB50DUP(0)SSEGENDSCODESEGMENTASSUMECS:CODE,SS:SSEG,DS:DATA;定義可以接收的最大字符數(shù);實(shí)際輸入字符數(shù);輸入字符緩沖區(qū)START:MOVAX,DATAMOVDS,AXMOVAX,SSEGMOVSS,AXMOVDX,OFFSETMESS1MOVAH,09HINT21HMOVAH,0AHMOVDX,OFFSETDATABUFINT21HCRLFMOVAL,STRINGCMPAL,38HJGEBELOWCMPAL,30HJNEABOVEMOVAL,[STRING+1]CMPAL,30HJNEABOVEDENG:MOVDX,OFFSETMESS4MOVAH,09HINT21H;顯示提示信息;接收二位字符;回車換行;當(dāng)?shù)扔?時跳轉(zhuǎn)至此JMPNEXTBELOW:MOVDX,OFFSETMESS3;小于0時跳轉(zhuǎn)至此MOVAH,09HINT21HJMPNEXTABOVE:MOVDX,OFFSETMESS2