Bitfields for LIR video adapter configuration:
Bit(s)	Description	)
 7	Hercules Graphics Card (HGC)
 6-5	reserved (0)
 4	VGA
 3	MCGA
 2	EGA
 1	CGA
 0	reserved (0)
Note:	multiple bits may be set if more than one video adapter is installed
SeeAlso: #04118