Int 15/AH=91h

OS HOOK - DEVICE POST (AT,PS)

AH = 91h
AL = device type (see #00507)
ES:BX -> request block for type codes 80h through BFh
CF clear

Return:
AH = 00h

Note: This function should be hooked by a multitasker to allow other tasks to execute while the BIOS is waiting for I/O completion; the default handler merely returns with AH=00h and CF clear

See Also: AH=90h

Category: Bios - Int 15h - O

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