Int 10 Fn 4F14  - Vesa Oem Extensions - Matrox Millenium (bios V2.1)       [-]

   AX = 4F14h
   BL = function
       00h installation check / get capabilities
       ES:DI -> 256-byte buffer for Matrox-specific information
           (see #0102)

       Return: ES:DI buffer filled
       01h ???
       BH = ???
       02h ???
       BH = ??? (bit flags?)
       03h ???
       SI = index of ???

       Return: CL = value of ???
       04h ???
       DX = ???

       Return: CL,EDX destroyed
       else

       Return: AX = FFFFh

Return: AL = 4Fh if function supported
       AH = status
       00h successful
       01h failed

Note:  this function is provided for OEMs to implement system-specific
     functionality in a VESA-compatible manner

Format of Matrox-specific VESA extensions information:
Offset Size    Description (Table 0102)
 00h  7 BYTEs  signature "VBE/MGA"
 07h 12 BYTEs  ??? (01h 01h 00h 00h 00h 00h 00h 00h 00h 07h 01h 02h)
 13h   DWORD   ->
 17h   DWORD   ->
 1Bh   DWORD   ->
 1Fh   DWORD   ->
 23h   DWORD   ->
 27h   DWORD   ->
 2Bh   WORD    ???
 2Dh   DWORD   ???
 31h   DWORD   ???
 35h   WORD    ???
 37h 201 BYTEs unused??? (cleared to 00h)