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AX = 5711h
BX = program ID??? (0201h used by GUEST.EXE)
DX = 496Fh ('Io')
Return:
CF clear if successful (storage medium in drive)
AX = new lock count
CF set on error (drive empty)
See Also: AX=5700h - AX=5701h - AX=5710h - AX=5712h
Category: Disk I/O Enhancements - Int 2Fh - I

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