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Code: Select all

mov al,0                     ;Colour to change
mov dx, 0x03C8          
out dx, al                    ;Tell DAC which colour to write to
mov al, 63                  
inc dx
out dx, al                    ;Set to white
out dx, al
out dx, al

Code: Select all

void VgaSetColor(unsigned char color, unsigned char red, unsigned char green, unsigned char blue){
	outportb(0x3C8, color);
	outportb(0x3C9, red);
	outportb(0x3C9, green);
	outportb(0x3C9, blue);
}

Code: Select all

 void scrn_init(void)
{
    //Assign video memory loc
    textmemptr = (unsigned short *)0xB8000; 
    //Write black (or at least almost black) to every colour
    unsigned char i =0;
    for (i=0;i<16;i++)
    {
    	Write_DAC_C_Palette(i,2,2,2);
    }
    //Write every text to screen in every colour
    for (i=0;i<16;i++)
    {
	settextcolor(i,0x00);
	printf("Colour: %d\n\0", i);
    }
}

//Writes a colour to the DAC
//In: uchar colour - the index of the colour to write
//     uchar r - red value (0-63)
//     uchar g - green value (0-63)
//     uchar b - blue value (0-63)
void scrn_dac_w(uchar colour, uchar r, uchar g,uchar b)
{
  outportb(0x03C8,colour);          //1st color to input!
  outportb(0x03C9,r);
  outportb(0x03C9,g);
  outportb(0x03C9,b);
}