X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - format of video save pointer table [ega/vga/mcga only]:

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Format of Video Save Pointer Table [EGA/VGA/MCGA only]:
Offset  Size    Description
 00h    DWORD   ptr to Video Parameter Table
 04h    DWORD   ptr to Parameter Dynamic Save Area, else 0 [EGA/VGA only]
 08h    DWORD   ptr to Alphanumeric Character Set Override, else 0
 0Ch    DWORD   ptr to Graphics Character Set Override, else 0
 10h    DWORD   [VGA only] ptr to Secondary Save Pointer Table, must be valid
 14h    DWORD   reserved, zero
 18h    DWORD   reserved, zero
Note: table initially in ROM, copy to RAM to alter, then update 40h:A8h.

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