内容发布更新时间 : 2025/3/17 6:18:11星期一 下面是文章的全部内容请认真阅读。
END START MOV CX,100
MOV AX,SEG LIST MOV DS,AX
MOV AX,SEG BLK MOV ES,AX LEA SI,LIST ADD SI,CX LEA DI,BLK ADD DI,CX STD
REP MOVSB 15
25. 答：
JMP SHORT LAB指令是一条双字节指令。这条指令取出后，(IP)=0102H，转移目标的偏移地址=(IP)+位移量。所以，转移目标的物理地址=(CS)╳16+(IP)+位移量。 （1）转移目标的物理地址=(CS)╳16+0158H （2）转移目标的物理地址=(CS)╳16+0182H （3）转移目标的物理地址=(CS)╳16+017AH （4）转移目标的物理地址=(CS)╳16+01E2H 26. 答： DSEG SEGMENT BUFFER DW 8 DB '12345678' DSEG ENDS CODE SEGMENT
ASSUME CS:CODE,DS:DSEG START:
MOV AX,DSEG MOV DS,AX MOV CX,BUFFER SAR CX,1
LEA SI,BUFFER MOV DI,SI ADD DI,2 AGAIN: ADD SI,2 MOV AL,[SI] AND AL,0FH
SAL BYTE PTR [SI+1],1 SAL BYTE PTR [SI+1],1 SAL BYTE PTR [SI+1],1 SAL BYTE PTR [SI+1],1 OR AL,BYTE PTR [SI+1]
17
MOV [DI],AL INC DI LOOP AGAIN EXIT:
MOV AH,4CH INT 21H CODE ENDS END START
DSEG SEGMENT ORG 10H DAT DB 10 DB ? DSEG ENDS CODE SEGMENT
ASSUME CS:CODE,DS:DSEG START: MOV AX,DSEG MOV DS,AX MOV AL,DAT MOV BL,AL SAL BL,1 ADD AL,BL MOV CL,2 SAL BL,CL ADD AL,BL MOV DAT+1,AL EXIT: MOV AH,4CH INT 21H CODE ENDS END START
16
27. 答： 28. 答： 29. 答： DSEG SEGMENT ORG 10H
DAT DB 10H,20H DB ?,? DSEG ENDS CODE SEGMENT
ASSUME CS:CODE,DS:DSEG START:
MOV AX,DSEG
18
MOV DS,AX MOV AL,DAT MOV AH,DAT+1 MOV CL,3 SAR AX,CL MOV DAT+2,AL MOV DAT+3,AH EXIT:
MOV AH,4CH INT 21H CODE ENDS END START DSEG SEGMENT
BLOCK DW 8 DUP (10H,20H,-3,-9) DSEG ENDS CODE SEGMENT
ASSUME CS:CODE,DS:DSEG START:
MOV AX,DSEG MOV DS,AX LEA SI,BLOCK MOV CX,32 AGAIN:
MOV AX,[SI] CMP AX,0 JNS NEXT NEG AX
MOV [SI],AX NEXT: INC SI INC SI LOOP AGAIN EXIT:
MOV AH,4CH INT 21H CODE ENDS END START 17 </