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Real mode |
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As opposed to protected mode, real mode is a mode in which Intel x86 processors can run. Memory addressing in real mode is nonlinear, requiring a program to stipulate a segment and memory offset address in order to access a location in memory. Originally appeared on the Intel 8086 CPU and has been the bane of PC programmers ever since. Although subsequent CPU chips supported protected-mode linear addressing, backward compatibility with the thousands of realmode applications slows the evolution of operating systems. Note that all Intel CPUs boot in real mode and require specific software support to switch into protected mode. |
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