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AX = B10Ah subfn 1022h BH = bus number BL = device/function number (bits 7-3 device, bits 2-0 function) DI = register number (0000h-00FFh) (see #00878)
Return:
CF clear if successful ECX = dword read CF set on error AH = status (00h,87h) (see #00729) 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 entry were exchanged between the initial drafts of the specification and final implementation
See Also: AX=B10Ah - AX=B10Ah/SF=1042h - AX=B10Ah/SF=8086h
Format of AMD Am53C974A PC-SCSI PCI configuration data: Offset Size Description (Table 00925) 00h 64 BYTEs header (see #00878) (vendor ID 1022h, device ID 2020h) 10h DWORD I/O base address (see PORT xxxxh"Am53C974A") 40h 16 BYTEs scratch registers (used by AMD's PC-SCSI drivers as follows: 40h/41h SCSI configuration register 0 (see #00926,#00927) ... 4Eh/4Fh SCSI configuration register 7)
See Also: #00747
Bitfields for AMD Am53C974A Target Device Configuration Register: Bit(s) Description (Table 00926) 15-14 reserved 13 "FSCSI" Fast SCSI drive is present 12-8 "SPD" synchronous period 7-4 synchronous offset (0 = asynchronous transfers) 3-1 SCSI bus status 0 target device is present and active. If 0, all other bits must be cleared to zero for target devices
See Also: #00925 - #00927
Bitfields for AMD Am53C974A Host Configuration Register: Bit(s) Description (Table 00927) 15-9 reserved 8 SCSI bus has been reset 7 starting BIOS number (bits 6-4) is valid 6-4 starting BIOS number (000 = BIOS drive 80h, 001 = drive 81h, etc) 3 this device is a SCSI host 2 protected-mode driver initialized 1 real-mode driver initialized 0 target device present. =0 indicates that this is a host if bit 3 is set
See Also: #00925 - #00926
Category: Expansion Bus Bios - Int 1Ah - P
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