已知某小型机字长为 16 位,其双操作数指令的格式如下: 其中 , OP 为操作码 , R 为通用寄存器编号 , A 为形式地址 。 是说明下列各种情况下能访问的最大主存区域有多少机器字 ? (1) A 为立即数。 (2) A 为直接主存单元地址 。 (3) A 为间接地址 ( 非多重 ) A 为变址的形式地址 , 假定变址寄存器固为 R 1 ( 字长为 16 位)
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