Int 1A Fn B188 - Intel PCi BIOS V2.0c - Read Configuration Byte (32-bit) [X]
AX = B188h
BL = bus number
BH = device/function number (bits 7-3 device, bits 2-0 function)
DI = register number (0000h-00FFh)
Return: as for AX=B108h
See Also: AX=B108h
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