INT 15H 81H: Device Close
[AT]
Expects: AH 81H
BX device ID
CX process ID
CF NC (0) (clear the Carry Flag before when invoking this fn)
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Returns: AX 0081H
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Info: This service is designed to be intercepted by a multitasking
operating system. It would be used, along with INT 15H fns 80H
and 82H to avoid device conflicts.
When unintercepted, the BIOS simply sets AH to 0 and clears CF.
See Also: INT 15H (extended AT services)
BIOS Data Area
ROM-BIOS Functions
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