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Int 21 Fn 250F P - Phar Lap 386/dos-extender - Convert Protected-mode Ad [E]
AX = 250Fh
ES:EBX = 48-bit protected-mode address to convert
ECX = 00000000h or length of data in bytes
Return: CF clear if successful (address < 1MB and contiguous)
ECX = 32-bit real-mode MS-DOS address
CF set on error (address >= 1MB or not contiguous)
ECX = linear address
Note: this function is also supported by FlashTek X-32VM
See Also: AX=2510h
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