Compatibility: EGA VGA

Expects: AX    1000H

BL    register number to set (a 4-bit attribute nibble: 00-0fH)

BH    6-bit RGB color to display for that attribute

Returns: (none)

Info: This sets a specified palette register on and EGA/VGA card to a

specified 6-bit RGB value; thereby changing the color that is

displayed for a graphics-mode color and a text-mode attribute.

BL is a palette register, 00H=0fH.  By default the palette is

programmed with the 16 colors described in the Video Attributes

topic.

BH is a 6-bit rgbRGB color setting, as follows:

 7 6 5 4 3 2 1 0 

     r g b R G B              Note: R,G,B are 2/3-intensity

                  bit               r,g,b are 1/3-intensity

              0: 01H Blue

              1: 02H Green

              2: 04H Red

              3: 08H blue' (also MDA-emulation underline)

              4: 10H green' (also CGA-emulation intensity)

              5: 20H red'

For example, video attribute 07H usually means white-on-black.

But after calling this with BL=00H and BH=24H, you have changed

all "black" attributes to mean "bright red", so video attribute

07H now displays as white characters on a bright red background

and 70H displays as bright red on white.

Notes: EGA/VGA BIOS does not check the validity of BL and will program

any of the ATC registers to the value in BH.  Thus, you can use

this to modify the border color, mode control and other ATC

registers at port 3c0H.  See EGA I/O Ports.

See Also: INT 10H 10H: EGA/VGA Palette Functions

INT 10H: Video Services

EGA/VGA Data Areas

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