Xycom XVME-654 Manual page 61

Locating the Universe Chip
This function returns the location (bus number) of the Universe chip providing the PCI
interface to the VMEbus.
ENTRY:
[AH] BIOS_FUNCTION_ID = B1h
[AL] BIOS_SUBFUNCTION_ID = 02h
[CX] Device ID = 0
[DX] Vendor ID = 10E3h
[SI] Index = 0
EXIT:
[BH] Bus Number (0-255)
[BL] Device Number is upper 5 bits
Function Number is bottom 3 bits
[AH] Return Code:
00h = Successful
86h = Device not found
83h = Bad Vendor ID
[CF] Completion Status, set = error, reset = success
Read Configuration Byte
This function reads individual bytes from the VMEbus interface configuration space.
ENTRY:
[AH] BIOS_FUNCTION_ID = B1h
[AL] BIOS_SUBFUNCTION_ID = 08h
[BH] Bus Number (0-255)
[BL] Device Number is upper 5 bits
Function Number is bottom 3 bits
[DI] Register Number (0...255)
EXIT:
[CL] Byte Read
[AH] Return Code:
00h = Successful
87h = Bad Register Number
[CF] Completion Status, set = error, reset = success
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Chapter 4 – Programming
4-10