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 PROTECTED-MODE ADDRESS TO MS-DOS
        AX = 250Fh
        ES:EBX -> 48-bit protected-mode address to convert
        ECX = length of data, in bytes
Return: CF clear if successful
            ECX = 32-bit MS-DOS address
        CF set on error
            ECX destroyed
SeeAlso: AX=2510h

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