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Assembly.Language.note.Ⅲ

 
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1.8086CPU有4个段寄存器: CS, DS, SS, ES.

2.CS和IP是8086CPU中两个关键寄存器, 它们指示了CPU当前要读取指令的地址.CS为代码段寄存器, IP为指令指针寄存器.

3.8086PC机中, 任意时刻, 设CS中的内容为M, IP中的内容为N, 8086CPU将从内存M * 16 + N单元开始, 读取一条指令并执行. 8086机中, 任意时刻, CPU将CS:IP指向的内容当作指令执行.

 

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