Int 1A/AX=B10Ah/SF=1042h

PCI BIOS v2.0c+ - READ CONFIGURATION DWORD (PC Technology devices)

AX = B10Ah subfn 1042h
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=1022h - AX=B10Ah/SF=1045h -

Format of PCI Configuration data for PC Technology RZ-1000 EIDE controller: Offset Size Description (Table 00928) 00h 64 BYTEs header (see #00878) (vendor ID 1042h, device ID 1000h) 10h DWORD base address for controller I/O registers (set to 01F1h for primary controller, 0171h for secondary) 14h DWORD base address for controller digital I/O port (set to 03F5h for primary, 0375h for secondary) 40h DWORD ???

bits 7-1:
???

bit 13:
Read-ahead mode enabled (Read-Ahead is buggy on original RZ-1000, and is thus typically disabled by clearing this bit)

bit 16:
??? 44h DWORD ??? 48h 8 BYTEs ??? 50h 176 BYTEs unused???

Category: Expansion Bus Bios - Int 1Ah - P

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