INT 10 - VIDEO - READ ALL PALETTE REGISTERS AND OVERSCAN REGISTER (VGA)
        AX = 1009h
        ES:DX -> 17-byte buffer (see AX=1002h)
Note:   UltraVision v2+ supports this function even on color EGA systems in
          video modes 00h-03h, 10h, and 12h; direct programming of the palette
          registers will cause incorrect results because the EGA registers are
          write-only.  To guard against older versions or unsupported video
          modes, programs which expect to use this function on EGA systems
          should set the ES:DX buffer to FFh before calling.
SeeAlso: AX=1007h,AX=CD02h