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AX = 5712h BX = program ID??? (0201h used by GUEST.EXE) DX = 496Fh ('Io')
Return:
AX = new lock count (00h = unlocked)
Note: If the lock count was already zero, the storage medium is ejected from the drive
See Also: AX=5700h - AX=5701h - AX=5710h - AX=5711h
Category: Disk I/O Enhancements - Int 2Fh - I
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