计算机等级考试三级PC技术上机11

2013年计算机等级考试三级PC技术上机（11）请编制程序，其功能是：以SOURCE开始的内存区域存放着多个字节的数据，其中有压缩BCD码和其他数据。现按下列编码规则进行编码：在第每个压缩BCD码前面加两个字节前缀代码BEH和CCH，并在其后加两个字后缀代码DDH和EDH;如果不是压缩BCD码，则该数据前后均加两个代码0DH和0EH。编码后的数据存放到RESULT指示的内存区域。例如：内存中有 12H,D9H,86H,54H结果为 BEH,CCH,12H,DDH,EDH,0EH,D9H,0DH,0EH,BEH,CCH,86H,DDH,EDH,BEH,CCH,86H,DDH,EDH部分程序已给出, 其中原始数据由过程LOAD从文件INPUT1.DAT中读入SOURCE开始的内存单元中。运算结果要求从RESULT开始存放,由过程SAVE保存到文件OUTPUT1.DAT中。填空BEGIN和END之间已给出的一段源程序使其完整(空白已用横线标出,每行空白一般只需一条指令, 但采用功能相当的多条指令亦可),或删除BEGIN和END之间原有的代码并自行编程来完成要求的功能。对程序必须进行汇编,并与IO.OBJ链接产生PROG1.EXE执行文件,最终运行程序产生结果(无结果或结果不正确者均不得分)。调试中若发现整个程序中存在错误之处, 请加以修改。试题程序：EXTRN LOAD:FAR,SAVE:FARN EQU 10STAC SEGMENT STACKDB 128 DUP(?)STAC ENDSDATA SEGMENTSOURCE DB N DUP(?)RESULT DB 5*N DUP(0)NAME0 DB INPUT1.DAT,0NAME1 DB OUTPUT1.DAT,0DATA ENDSCODE SEGMENTASSUME CS:CODE,DS:DATA,SS:STACSTART PROC FARPUSH DSXOR AX,AXPUSH AXMOV AX,DATAMOV DS,AXMOV ES,AX ;置附加段寄存器LEA DX,SOURCE ;数据区起始地址LEA SI,NAME0 ;原始数据文件名MOV CX,N ;字节数CALL LOAD ;从INPUT1.DAT中读取数据;*BEGIN*LEA SI,SOURCEMOV DI,OFFSET PDATA ;PDATA为正数数组存放缓冲区首址MOV CX,NCLP1: MOV AL,SIMOV BL,ALMOV AH,AL_AND AL,0F0H_MOV CL,4_POP CXCMP _JA CLP2CMP AH,9JA CLP2MOV _INC DIMOV BYTE PTRDI,0CCHINC DIMOV BYTE PTRDI,BLINC DIMOV BYTE PTRDI,0DDHINC DIMOV BYTE PTRDI,0EDHJMP CLP3CLP2: MOV BYTE PTRDI,0DHINC DIMOV BYTE PTRDI,0EHINC DIMOV BYTE PTRDI,BLINC DIMOV BYTE PTRDI,0DHINC DIMOV BYTE PTRDI,0EHCLP3: INC SIINC DI_;*END*LEA DX,RESULT ;结果数据区首址LEA SI,NAME1 ;结果文件名MOV CX,N+2 ;字节数CALL SAVE ;保存结果到文件RETSTART ENDPCODE ENDSEND 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