题目内容

I/O端口地址的编址方式有统一编址和独立编址，其中独立编址的特点是。

A. I/O端口与存储单元在同一个地址空间中进行编址
B. I/O端口与存储单元分别进行编址，两者地址空间相互独立，互不影响。
C. 所有访问内存的指令都适用于I/O端口
D. 以上都不对

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