INT 10,10 - Set/Get Palette Registers (EGA/VGA)

	AH = 10h

	AL = 00  set individual palette register
	   BH = color value
	   BL = palette register


	AL = 01  set border color (overscan register)
	   BH = color value


	AL = 02  set all palette registers and border
	   ES:DX = pointer to 17 byte table representing 16 palette
		   registers and border color register


	AL = 03  toggle intensity/blinking (EGA)
	   BL = 0  enable intensity
		1  enable blinking


	AL = 07  read palette register (PS/2)
	   BL = palette register to read (0-15)

	on return:
	  BH = value of palette register


	AL = 08  read border color (overscan register, PS/2)

	on return:
	  BH = value of border color (overscan register)


	AL = 09  read palette registers and border (PS/2)
	   ES:DX = pointer to 17 byte table representing 16 palette
		   registers and border color register

	on return:
	ES:DX = pointer to table provided as input


	AL = 10  set DAC color register
	   BX = color register to set
	   CH = green value
	   CL = blue value
	   DH = red value


	AL = 12  set block of DAC color registers
	   BX = first color register to set
	   CX = number of color registers to set
	   ES:DX = pointer to table of color values to set


	AL = 13  set attribute controller color select state
	   BL = 0  set Mode Control register bit 7
	      BH = value for bit 7
	   BL = 1  set color select register
	      BH = value for color select register


	AL = 15  read DAC color register (PS/2)
	   BX = color register to read

	on return:
	CH = green value
	CL = blue value
	DH = red value


	AL = 17  read block of DAC color registers
	   BX = first color register to read
	   CX = number of color registers to read
	   ES:DX = pointer to buffer for color registers

	on return:
	ES:DX = pointer to color table provided as input


	AL = 18  update video DAC mask register
	   BL = new mask


	AL = 19  read video DAC mask register

	on return:
	BL = value read from video DAC mask register


	AL = 1A  read color page state
	   BL = bit 7 of Mode Control Register
	   BH = bits 2 thru 3 of Color select register if BL = 0
	      = bits 0 thru 3 of Color select register if BL = 1

	on return:
	BL = current paging mode
	CX = current page



	AL = 1B  sum color values to shades of gray
	   BX = first color register to sum
	   CX = number of color registers to sum


	- controls the pixel color mapping bit values
	- BIOS extension to EGA/VGA systems