单项选择题
A.除法出错,单步 B.NMI,单步 C.NMI,INTR D.除法出错,INTR
A.00000H~003FFH B.00400H~007FFH C.FFFFFH~FF800H
A.0~255 B.1~255 C.0~127 D.0~1023
A.255B.256C.128D.1024
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