第2章算术指令.ppt

下列出栈操作的结果是_________。SP=2500H,RAM2500~2505H内分别存放10H,20H,30H,40H,50H,60H六个数,执行MOVSP,2502H,POPBX两指令后,SP=_______BX=_______。2504H4030H假定(SS)=2000H,(SP)=0100H,(AX)=2107H,执行指令PUSHAX后,存放数据21H的物理地址是___________。200FFH设AX=C544H,在执行指令ADDAH,AL之后,______。A) CF=0,OF=0 B) CF=0,OF=1 C)CF=1,OF=0 D) CF=1,OF=1答案:C下列指令中合法的是_________。A) MOV 02H, AX B) ADDCS,AXC) SUB [BX], [100H] D) MOV SI, [SI]答案:D假定(AL)=85H,(CH)=29H,依次执行SUBAL,CH指令和DAS指令后,AL的值是_____。56H下列指令中合法的是________。A)AL,257 B)OUTCX,ALC)IN2,253 D)OUTDX,AL答案:D假设(DS)=1000H,(ES)=0200H,(BP)=0100H,(DI)=0200H,(10200H)=11H,(10201H)=12H,执行指令LEADX,[BP][DI]后,(DX)=_______。0300H假设(DS)=1000H,(DI)=0400H,(10410H)=FFH,(10411H)=00H,下列指令执行(AX)值是0420H的指令是________。A)LEAAX,20H[DI] B)MOVAX,OFFSETDIC)MOVAX,20H[DI] D)LEAAX,[DI]答案:AINC指令不影响______标志。A)OF B)CF C)SF D)ZF答案:B假定(DS)=4000H,(DI)=0100H,(40100H)=55H,(40101H)=AAH,执行指令LEABX,[DI]后,BX中的内容是_______。0100H指令MOVARRAY[DI],DX的寻址方式是______。A)变址寻址 B)寄存器间接寻址C)基址寻址 D)基址加变址寻址答案:A下列出栈操作,结果正确的是________。设SP=000CH,SS=00A8H,在执行POPAX指令后得到栈顶的物理地址是:A)000EH B)00A8EH C)00AH D)00A8AH答案:B将累加器AX的内容清零的正确指令是_____。A)AND AX,0 B)XORAX,AX C)SUBAX,Ax D)CMP AX,AX答案:ABC设(SP)=2800H,使(SP)=27FEH的正确指令是______A)PUSH AX B)MOV SP,27FEHC)POPAX D)MOV[SP],27FEH答案:AB在ADD指令中,两个操作数的物理位置可以安排在_____中。:BCD设(AL)=-68, (BL)=86, 执行SUBAL,BL指令后,正确的结果是_____。A)SF=1 B)ZF=0 C)CF=1 D)OF=1答