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.