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 - CONVERT LINEAR TO PHYSICAL ADDRESS
        AX = 2509h
        EBX = linear address to convert
Return: CF clear if successful
            ECX = physical address (carry flag clear)
        CF set if linear address not mapped in page tables

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