Int 21/AX=250Fh

Phar Lap 386/DOS-Extender - CONVERT PROTECTED-MODE ADDRESS TO MS-DOS

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

Category: DOS Extenders - Int 21h - P

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