INT 10H 1012H: Set a Block of DAC Color Register

                                                          Compatibility: VGA 
 Expects: AX    1012H
          BX    first DAC register to set (0-00ffH)
          CX    number of registers to set (0-00ffH)
          ES:DX addr of a table of R,G,B values (it will be CX*3 bytes long)
 Returns: (none)
    Info: On VGAs, this sets the RGB values for a consecutive block of DAC
          color registers.  Starting with register number in BX, CX
          registers are programmed with values from the table at ES:DX.

    ES:DX is the address of a series of 3-byte RGB values, laid out as
          Red,Green,Blue, Red,Green,Blue,...  The table should be CX*3
          bytes long.

          See INT 10H 1010H (set one DAC color register) for related info.

   Notes: Use INT 10H 1017H to obtain the current settings for a block of
          DAC color registers.
          See INT 10H 1013H for a reason why you might tend to work with
          16- or 64-register blocks.

See Also: INT 10H 10H: EGA/VGA Palette Functions
          INT 10H: Video Services
          EGA/VGA Data Areas
          VGA I/O Ports