掩模只读存储器是一种只读存储器。
考虑到目前内存的价格，交换空间是一种非常缓慢的辅助存储器。
With current memory prices, swap space represents a very slow secondary memory.
计算机存储器还需要做另一种形式的计算，那就是计算出内存指令地址。
The problem is that there is another form of calculation a stored instruction computer needs to do. That is it has to figure out where in memory instructions are.
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