實(shí)驗(yàn)九一、實(shí)驗(yàn)?zāi)康?．熟悉系統(tǒng)功能調(diào)用IＮT2１Ｈ的有關(guān)功能2.編寫(xiě)時(shí)鐘程序二、實(shí)驗(yàn)任務(wù)1．執(zhí)行時(shí)鐘程序時(shí),屏幕上顯示提醒符“：”，由鍵盤(pán)輸入當(dāng)前時(shí)、分、秒值,即ＸＸ：ＸX:XX,隨即顯示時(shí)間并不斷地計(jì)時(shí)。2.當(dāng)有鍵盤(pán)按下時(shí)，立即停止計(jì)時(shí),返回DOS。三、源程序ＤAＴASEGMＥＮTBＵFFERDＢ１1DB?ＤＢ10DUP(?）DAＴAENDＳCOＤEＳＥGMENＴＡＳSUMECS:ＣＯDE,DS:DAＴAOUTＣLK:ＭOＶＡＸ,DＡTAMOVＤS，AXＭOVDＬ，'：＇MＯＶＡH，2ＩNT21HＭOVDＸ,OFＦSETBＵFFERMOＶAH,0AH；輸入字符串ＩNＴ2１HＭOVBX,ＯFＦSＥTＢUＦＦER+2MOＶAL，[BX];時(shí)針,AＳCＩI碼轉(zhuǎn)非壓縮BCDCMPAL,0３AＨJAEEＲROＲ１CMＰAL,02FＨＪBEERROR１ANDAL，０FHMＯV[BX］,ALＩＮＣBXMOVAＬ,[BＸ]ＡNDAL,0FHＭOＶ[BX］,ALIＮＣＢXIＮCBXMOVAL,[BＸ];分針AＮDAL，0FHMＯV[ＢX］,ALＩNCBXMOVＡL,［BX]ＡNＤAL,０FＨMOV［BＸ],ALINCBXINＣＢXＭOVAＬ,[BX];秒針ANＤAL,0FＨMOV[ＢX],ＡＬINＣBXMOＶAL，[ＢX]AＮDAL，0ＦHMOV［BX］，ALMOVＢX,ＯFFSETBＵＦFEＲ+2CAＬＬＴＯＢCD;時(shí)針,兩位非壓縮BＣD轉(zhuǎn)換成兩位壓縮BCＤMＯVＣＨ,ＡLＡDＤBＸ,３CALLTＯBCＤMOVDH，AL;分針，兩位非壓縮ＢCD轉(zhuǎn)換成兩位壓縮BＣＤMOVDH,ALADＤBＸ,3ＣＡLLTOBCD;秒針，兩位非壓縮ＢCD轉(zhuǎn)換成兩位壓縮ＢCＤMOＶDＬ,ＡLCMPCH，2４HJAＥERROＲCMＰDH,６0HＪＡEＲRORＣMＰDL,6０HJAERRORERROR1:MOVAH,4CＨＩＮT2１HAGＡIＮ：CALLDEＬAYMOVAＬ,DＬ;秒針加1ADDAL，1DＡAMOVDL,ＡLCＭＰAL,６０HJAERRＯRＪＮEＤＩSPYMOＶDL,0MOＶAL,DHAＤDAL,１;分針DAＡMOＶDH,ALCMＰＡＬ，60HJAＥRRORJＮＥDISＰYMOVＤＨ，0MOVAL,CHADDAL,1ＤＡA;時(shí)針MOVCH，ALCMPＡL,24ＨＪAEERＲORＪNEDISPYＭOＶCH,０EＲROＲ:MＯＶDL，0MOVDＨ,0ＭＯVＣH,0ＤＩSPＹ:MOＶBX，ＯFFSEＴBUＦFERMOVAL,０DHMOＶ[BＸ],ALINCBXＭOＶＡL,0MＯV［BX］,AＬＩNCBXMＯＶAL,CＨCＡLLTRAＮINCBXMＯVＡL,':＇MOV[ＢX］，AＬＩＮＣBXMOＶAL,DHCＡLLＴRANINCBXMOＶAL,':'ＭOＶ[ＢX］,ALINCBＸＭOVＡL,DＬCAＬLTRANINCBXMＯVＡL,＇＄＇MOV[BX],ALPＵSHBXPUSHＣXPUSHDＸMＯVDＸ,OFFSＥTＢUFＦEＲMOVAH，９INT21HMOVＡH,06ＨMＯVDL,0FFＨ INＴ21HＰOＰＤXＰOＰCXPＯPBXJNEGOJMPAGAINGO:MOVAH，4CＨINＴ21ＨTＯBCDPＲOC；兩位非壓縮BCD轉(zhuǎn)換成壓縮MOVAL,[ＢX]MＯVＣL,4SHLAL，ＣLOＲAL,［BX＋1］RETTOＢCDENDPTRANPＲＯＣ;ＢCＤ轉(zhuǎn)ASCＩIMＯVCL，ALＳHRAL,1SHRAL，1ＳＨRAL,1SHRＡL,１O(jiān)ＲAL,３0ＨＭOＶ[BX]，ALＩＮCＢＸMＯVAＬ,CLAＮDAL,0FHOＲAＬ,30HMOV[ＢX],AＬRETTＲANＥＮＤPＤＥLAYPROCPＵSHCＸPUSHAXMOVAX,0FFFFHFIＲ:MOVＣＸ,0２FＦFHGOOＮ:DＥCＣXJNＥGＯＯＮDECAXJNEFIRPOPAＸＰＯPＣ