设DS=1100H,(12000H)=80H,(12001H)=20H,(12002H)=30H,执行MOV AX, 〔1000H〕则AX=( )
A.8000H B.0080H C.2080H D.8020H
为什么选 C
设DS=1100H,(12000H)=80H,(12001H)=20H,(12002H)=30H,执行MOV AX, 〔1000H〕则AX=( )
A.8000H B.0080H C.2080H D.8020H
为什么选 C
答案选C。
因为 MOV AX,(1000H),是将1000H里的内容送到AX的低半字节。(1000H)是偏移地址,其物理地址应该是(DS*16d+1000H)=(12000H)=80H,而高半字节AH就应该是(120001H)=20H。所以AX=2080H。