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 flawedâ€”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.