INT 1A - PCI BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. v2.0c+ - READ CONFIGURATION DWORDDoubleword; four bytes. Commonly used to hold a 32-bit segment:offset or selector:offset address. (AMD devices) 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 SeeAlso: 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 DWORDDoubleword; four bytes. Commonly used to hold a 32-bit segment:offset or selector:offset address. I/O base address (see PORTIBM PC Portable (uses same BIOS as XT) xxxxh"Am53C974A") 40h 16 BYTEs scratch registers (used by AMD's PC-SCSI drivers as follows: 40h/41h SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer. A host adapter connects the SCSI bus to the computer's own bus. See also ESDI, IDE. configuration register 0 (see #00926,#00927) ... 4Eh/4Fh SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer. A host adapter connects the SCSI bus to the computer's own bus. See also ESDI, IDE. configuration register 7) SeeAlso: #00747 Bitfields for AMD Am53C974A Target Device Configuration Register: Bit(s) Description (Table 00926) 15-14 reserved 13 "FSCSI" Fast SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer. A host adapter connects the SCSI bus to the computer's own bus. See also ESDI, IDE. drive is present 12-8 "SPD" synchronous period 7-4 synchronous offset (0 = asynchronous transfers) 3-1 SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer. A host adapter connects the SCSI bus to the computer's own bus. See also ESDI, IDE. bus status 0 target device is present and active if 0, all other bits must be cleared to zero for target devices SeeAlso: #00925,#00927 Bitfields for AMD Am53C974A Host Configuration Register: Bit(s) Description (Table 00927) 15-9 reserved 8 SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer. A host adapter connects the SCSI bus to the computer's own bus. See also ESDI, IDE. bus has been reset 7 starting BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. number (bits 6-4) is valid 6-4 starting BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. number (000 = BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. drive 80h, 001 = drive 81h, etc) 3 this device is a SCSI(Small Computer Systems Interface) A system-independent expansion bus typically used to connect hard disks, tape drives, and CD-ROMs to a computer. A host adapter connects the SCSI bus to the computer's own bus. See also ESDI, IDE. 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 SeeAlso: #00925,#00926