Format of FGDRIVER GETRGB variable pointer record:
Offset	Size	Description	)
 00h	WORD	segment of WORD buffer for red component of DAC register
 02h	WORD	offset of WORD buffer for red component
 04h	WORD	segment of WORD buffer for green component of DAC register
 06h	WORD	offset of WORD buffer for green component
 08h	WORD	segment of WORD buffer for blue component of DAC register
 0Ah	WORD	offset of WORD buffer for blue component