X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - phar lap 386/dos-extender

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INT 21 - Phar Lap 386/DOS-Extender - GET SEGMENT LINEAR BASE ADDRESS
        AX = 2508h
        BX = segment selector
Return: CF clear if successful
            ECX = linear base address of segment
        CF set if invalid segment selector

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