X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - os/286, os/386

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INT 21 - OS/286, OS/386 - CHANGE SEGMENTS
        AH = E9h
        AL = function
            01h change code segment parameters
            02h change data segment parameters
            05h adjust segment limit
            06h change segment base address
        ???
Return: ???
Note:   protected mode only???

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