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Where does CPU Enhanced mode originate from?


Intel’s 80386 was the first 32-bit processor, and since the company had to backward-support the 8086. All the modern Intel-based processors run in the Enhanced mode, capable of switching between Real mode (just like the real 8086) and Protected mode, which is the current mode of operation.

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Where does the Real mode on the CPU come from?Name the processor lines of two major manufacturers?