南邮 微机原理微机原理实验.docx
南邮 微机原理微机原理实验 ;FILEMENT:EXA131.ASM .486 DATA SEGMENT USE16 SUM DB ?,? MESG DB '25+9=' DB 0,0 N1 DB 9,0F0H N2 DW 25 DATA ENDS CODE SEGMENT USE16 ASSUME CS:CODE,DS:DATA BEG: MOV AX,DATA MOV DS,AX MOV BX,OFFSET SUM MOV AH,N1 MOV AL,BYTE PTR N2 ADD AH,AL MOV BX,AH CALL CHANG MOV AH,9 MOV DX,OFFSET MESG INT 21H MOV AH,4CH INT 21H CHANG PROC LAST :CMP BYTE PTR BX,10 JC NEXT SUB BYTE PTR BX,10 INC BYTE PTR BX+7 JMP LAST NEXT: MOV DX,word ptr SUM ADD BX+8,DX ADD BYTE PTR BX+7,30H ADD BYTE PTR BX+8,30H RET CHANG ENDP CODE ENDS END BEG 1.1 程序修改 ;FILENAME: EXA131.ASM .486 DATA SEGMENT USE16 SUM DB ?,? MESG DB '25+9=' DB 0,0,'$' N1 DB 9,0F0H N2 db 25 data ENDS CODE SEGMENT USE16 ASSUME CS:CODE,DS:DATA BEG: MOV AX,DATA MOV DS,AX MOV BX,OFFSET SUM MOV AH,N1 MOV AL,N2 ADD AH,AL MOV BX,AH CALL CHANG MOV AH,9 MOV DX,OFFSET mesg INT 21H MOV AH,4CH INT 21H chang PROC LAST: CMP byte ptr BX,10 JC NEXT SUB byte ptr BX,10 INC byte ptr BX+7 JMP LAST NEXT: mov dx,word ptr sum ADD BX+8,dx ADD byte ptr BX+7,30H ADD byte ptr BX+8,30H ret chang endp CODE ENDS END BEG 2.1 学生成绩 ;FILENAME EXA241.ASM .486 DATA SEGMENT USE16 N EQU 10 SCORE DB 43,51,61,71,75,82,86,92,99,100 S5 DB 0 S6 DB 0 S7 DB 0 S8 DB 0 S9 DB 0 S10 DB 0 MESG1 DB 'S5(0-59):','$' MESG2 DB ' S6(60-69):','$' MESG3 DB ' S7(70-79):','$' MESG4 DB ' S8(80-89):','$' MESG5 DB ' S9(90-99):','$' MESG6 DB ' S10(100):','$' DATA ENDS CODE SEGMENT USE16 ASSUME CS:CODE,DS:DATA BEG:MOV AX,DATA MOV DS,AX MOV AH,00H ; MOV AL,3 ; INT 10H ;前面三行可以去掉不影响运行 MOV CX,N AND CX,00FFH MOV BX,OFFSET SCORE COUNT:CMP BYTE PTR BX,59 JNA COUNT1 CMP BYTE PTR BX,69 JNA COUNT2 CMP BYTE PTR BX,79 JNA COUNT3 CMP BYTE PTR BX,89 JNA COUNT4 CMP BYTE PTR BX,99 JNA COUNT5 INC S10 JMP SHORT NEXT COUNT1 PROC INC S5 INC BX JMP SHORT NEXT COUNT1 ENDP COUNT2 PROC INC S6 INC BX JMP SHORT NEXT COUNT2 ENDP COUNT3 PROC INC S7 INC BX JMP SHORT NEXT COUNT3 ENDP COUNT4 PROC INC S8 INC BX JMP SHORT NEXT COUNT4 ENDP COUNT5 PROC INC S9 INC BX JMP SHORT NEXT COUNT5 ENDP NEXT:LOOP COUNT MOV AH,09H MOV DX,OFFSET MESG1 INT 21H MOV AH,02H MOV DL,30H ADD DL,S5 INT 21H MOV AH,09H LEA DX,MESG2 INT 21H MOV AH,02H MOV DL,30H ADD DL,S6 INT 21H MOV AH,09H LEA DX,MESG3 INT 21H MOV AH,02H MOV DL,30H ADD DL,S7 INT 21H MOV AH,09H LEA DX,MESG4 INT 21H MOV AH,02H MOV DL,30H ADD DL,S8 INT 21H MOV AH,09H LEA DX,MESG5 INT 21H MOV AH,02H MOV DL,30H ADD DL,S9 INT 21H MOV AH,09H LEA DX,MESG6 INT 21H MOV AH,02H MOV DL,30H ADD DL,S10 INT 21H MOV AH,4CH INT 21H CODE ENDS END BEG 为什么去掉 MOV AH,02H 语句后就无法输出正确结果(数值就不对)呢？ MOV DL,30H ADD DL,S10 INT 21H 这三条语句为什么能够把统计的数值给输出出来呢？如是 S10：1 它是怎么输出的？为什么 S10：后就会接着显示 1 呢？ MOV AH,00H ; MOV AL,3 ; INT 10H ; 这三条语句有什么作用？ 2.2 通信字 .486 DATA SEGMENT USE16 BUF1 DB '123456' BUF2 DB '000000' BUF3 DB 'Please input communication words:',0DH,0AH,'$' BUF4 DB 3 OUT1 DB 'ERRORS',0DH,0AH,'$' OUT2 DB 'RIGHT',0DH,0AH,'$' OUT3 DB '*','$' OUT4 DB 0DH,0AH,'$' DATA ENDS CODE SEGMENT USE16 ASSUME CS:CODE,DS:DATA,ES:DATA BEG: LAST1: LAST: EXIT: LAST2: CODE MOV MOV MOV MOV MOV INT LEA LEA MOV MOV MOV LEA INT MOV INT MOV INC MOV MOV INT LOOP MOV LEA INT MOV CLD REPE JZ MOV LEA INT DEC JZ JMP MOV LEA INT MOV INT ENDS END AX,DATA DS,AX ES,AX AH,00H AL,3 10H SI,BUF1 DI,BUF2 BX,OFFSET BUF2 CX,6 AH,09H DX,BUF3 21H AH,07H 21H BYTE PTR BX,AL BX AH,09H DX,OFFSET OUT3 21H LAST AH,09H DX,OUT4 21H CX,6 CMPSB EXIT AH,09H DX,OUT1 21H BUF4 LAST2 LAST1 AH,09H DX,OUT2 21H AH,4CH 21H BEG
