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AX = 251Bh EDX = number of pages to unlock if BL = 00h ECX = linear address of first page to unlock if BL = 01h ES:ECX -> pointer to first page to unlock
Return:
CF clear if successful CF set on error EAX = error code 09h invalid address range
See Also: AX=251Ah - AX=EB07h - INT 31/AX=0601h
Category: DOS Extenders - Int 21h - P
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