Format of Extended BIOS Data Area (see 40:0Eh for ptr) [PS only]

Offset  Size    Description
 00h   BYTE    Length of EBDA in kilobytes
 01h 15 BYTEs  reserved
 17h   BYTE    Number of entries in POST error log (0-5)
 18h  5 WORDs  POST error log (each word is a POST error number)
 19h-21h   reserved
 22h   DWORD   Pointing Device Driver entry point
 26h   BYTE    Pointing Device Flags 1
          bit 7:    =1 command in progress
          bit 6:    =1 resend
          bit 5:    =1 acknowledge
          bit 4:    =1 error
          bit 3:    =0 reserved
          bits 2-0: index count
 27h   BYTE    Pointing Device Flags 2
          bit 7:    =1 device driver far call flag
          bits 6-3: reserved
          bits 2-0: package size
 28h  7 BYTEs  Pointing Device Auxiliary Device Data
 2Fh   BYTE    reserved
 30h   DWORD   Vector for INT 07h stored here during 80387 interrupt
 34h   DWORD   Vector for INT 01h stored here during INT 07h emulation
 38h   BYTE    Scratchpad for 80287/80387 interrupt code
 39h   WORD    Timer3: Watchdog timer initial count
 3Bh   BYTE    ??? seen non-zero on Model 30
 3Ch   BYTE    ???
 3Dh 16 BYTEs  Fixed Disk parameter table for drive 0 (for older machines
           which don't directly support the installed drive)
 4Dh 16 BYTEs  Fixed Disk parameter table for drive 1 (for older machines
           which don't directly support the installed drive)
 5Dh-6Bh   ???
 6Ch   BYTE    Fixed disk: (=FFh on ESDI systems)
           bits 7-4: Channel number 00-0Fh
           bits 3-0: DMA arbitration level 00-0Eh
 6Dh   BYTE    ???
 6Eh   WORD    current typematic setting (see INT 16/AH=03h)
 70h 167 BYTEs ???
117h   WORD    keyboard ID (see INT 16/AH=0Ah)
119h and up:   ??? seen non-zero on Model 60
3F0h   BYTE    Fixed disk buffer (???!!!)