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

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Format of Secondary Video Save Pointer Table [VGA only]:
Offset  Size    Description
 00h    WORD    Length of this table in bytes, including this word (1Ah)
 02h    DWORD   ptr to Display Combination Code Table, must be valid
 06h    DWORD   ptr to second Alphanumeric Character Set Override, else 0
 0Ah    DWORD   ptr to User Palette Profile Table, else 0
 0Eh    DWORD   reserved, zero
 12h    DWORD   reserved, zero
 16h    DWORD   reserved, zero
Note: table initially in ROM, copy to RAM to alter, then alter Save Ptr Table.

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