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问答题
若AX=5555H,BX=FF00H,试问在下列程序段执行后,AX=?BX=?CF=?
AND AX, BX ; AX = 5500,BX = FF00H
XOR AX, AX ; AX = 0000H
NOT BX ; BX = 00FFH
问答题
设SP=2000H,AX=3000H,BX=5000H,执行下列片段程序后,问SP=?AX=?BX=?
PUSH AX ;SP ← SP - 2 = 1FFEH,AX=3000H
PUSH BX ;SP ← SP - 2 = 1FFCH,BX=5000H
POP AX ;SP ← SP + 2 = 1FFEH,AX=5000H
问答题
假定PC机存储器低地址区有关单元的内容如下:
(20H)=3CH,(21H)=00H,(22H)=86H,(23H)=0EH且CS=2000H,IP=0010H,SS=1000H,SP=0100H,FLAGS=0240H,这时若执行INT8指令,试问:
(1)程序转向从何处执行(用物理地址回答)?
(2)栈顶6个存储单元的地址(用逻辑地址回答)及内容分别是什么?
问答题
问答题
问答题
指出8086/8088下列指令的错误何在:
(1)MOV [SI], IP
(2)MOV CS, AX
(3)MOV BL, SI+2
(4)MOV 60H, AL
(5)PUSH 2400H
(6)INC [BX]
(7)MUL -60H
(8)ADD [2400H], 2AH
(9)MOV [BX], [DI]
(10)MOV SI, AL