Format of Extended BIOS Data Area (AMI v1.00.12.AX1T)

Offset  Size    Description     (Table M004)
 00h   BYTE    length of XBDA in kilobytes
 01h 15 BYTEs  reserved
 17h   BYTE    number of entries in POST error log (0-10)
 18h 10 BYTEs  unused???
 22h   DWORD   Pointing Device Driver entry point
 26h   BYTE    Pointing Device Flags 1 (see #M002)
 27h   BYTE    Pointing Device Flags 2 (see #M003)
 28h  8 BYTEs  Pointing Device Auxiliary Device Data
 30h 13 BYTEs  ???
 3Dh 16 BYTEs  Fixed Disk parameter table for drive 0
 4Dh 16 BYTEs  Fixed Disk parameter table for drive 1
 5Dh 16 BYTEs  parameter table for drive 2???
 6Dh 16 BYTEs  parameter table for drive 3???
 80h 56 BYTEs? IDE drive 0 manufacturer/model string
 B8h 41 BYTEs  AMIBIOS copyright string
 E1h       unused???
102h   WORD    ??? flags
       bit 15: ???
108h   WORD    offset of IntelIDECfgTbl (IDE configuration settings) within
         segment F000h
10Ah  2 BYTEs  ???
10Ch   DWORD   pointer to routine to call for language-specific error messages
110h   WORD    offset in segment F000h of end of currently-loaded optional
         BIOS subsystems (language, APM, etc.)
112h   WORD    offset in segment F000h of end of area avaiable for loading
         optional BIOS subsystems
1F0h   BYTE    APM status flags
1F1h  8 BYTEs  APM power-state data for device classes 01h-06h
       bits 0-3: current power state for devices 00h-03h in class
       bits 7-4: current engaged state for devices 00h-03h in class
1F9h  4 BYTEs  APM power-state data for device classes 01h-08h (four devices
         per class)
1FDh  3 BYTEs  ???
200h 10 WORDs  POST error log
214h   ???

See Also: #M001,#M005