ADVANCED INTEL & PENTIUM MICROPROCESSORS
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The 8086 and 8088 microprocessors were followed by the 80286, the first Intel processor to offer
Protected Mode. However, as mentioned, that mechanism was flawed—once switched to Protected
Mode the only way to switch the processor back to Real Mode was to terminate all currently running
applications and reset the chip. Because MS-DOS, a Real Mode operating system, was dominant at
the time, few 286 chips were ever run in Protected Mode.