Format of Video Parameter Dynamic Save Area [EGA, VGA only]

Offset  Size    Description
 00h 16 BYTEs  Last data written to Attribute Contr. Palette Registers 0-15
 10h   BYTE    Last data written to Attribute Controller Overscan Register
 11h-FFh   Reserved

       Note: Need for table was that EGA registers were write-only.

       Note: If default values (from the Video Parameter Table) are
             over-ridden at a mode set by the VGA User Palette Profile
             Table, then the Dynamic Save Area is updated with the
             default values, not the User Profile ones.