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一条双字长的 LOAD指令存储在地址为200和201的存储位置,该指令将指定的内容装入累加器AC中。指令的第一个字指定操作码和寻址方式,第二个字是地址部分,寄存器与主存的内容示意图如图4.8所示。指令寻址方式字段可指定任何一种寻址方式,问在下列寻址装入AC的值。 ( 1)直接寻址 AC=( ) ( 2)立即寻址 AC=( ) ( 3)间接寻址 AC=( ) ( 4)相对寻址 AC=( ) ( 5)变址寻址 AC=( ) ( 6)寄存器R1寻址 AC=( ) ( 7)寄存器R1间接寻址 AC=( )
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