Int 15/AH=80h

OS HOOK - DEVICE OPEN (AT,XT286,PS)

AH = 80h
BX = device ID
CX = process ID
CF clear

Return:
CF clear if successful
AH = 00h
CF set on error
AH = status (see #00496)

Note: This function should be hooked by a multitasker which wishes to keep track of device ownership; the default BIOS handler merely returns successfully

See Also: AH=81h - AH=82h



(Table 00496)
Values for status:
80h    invalid command (PC,PCjr)
86h    function not supported (XT)

Category: Bios - Int 15h - O

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