Int1Ah AX = B103h(搜尋PCI類別碼) -- BIOS Int1Ah

FIND PCI CLASS CODE

Input:
    AX = B103h
    ECX = class code
        bits 31-24 unused
        bits 23-16 class
        bits 15-8  subclass
        bits 7-0   programming interface
    SI = device index (0-n)
Return: 
    CF clear if successful
    CF set on error
    AH = status (00h,86h) (see Format of floppy format address field buffer entry)
        00h successful
        BH = bus number
        BL = device/function number (bits 7-3 device, bits 2-0 func)
        86h device not found
    EAX, EBX, ECX, and EDX may be modified

all other flags (except IF) may be modified

Notes:  

• this function may require up to 1024 byte of stack; it will not enable interrupts if they were disabled before making the call

• the meanings of BL and BH on return were exchanged between the initial drafts of the specification and final implementation

• all devices sharing the same Class Code may be enumerated byincrementing SI from 0 until error 86h is returned