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AX = B189h BH = bus number BL = device/function number (bits 7-3 device, bits 2-0 function) DI = register number (0000h-00FFh)
Return:
As for AX=B109h
Note: The meanings of BL and BH on return were exchanged between the initial drafts of the specification and final implementation
See Also: AX=B109h - AX=B188h - AX=B18Ah
Category: Expansion Bus Bios - Int 1Ah - P
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