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.

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