Bitfields for Intel 82443BX/EX/LX Graphics Aperture Size Control:
Bit(s)	Description	)
 7-6	reserved
 5-0	aperture size
	000000 256M
	100000 128M
	110000 64M
	111000 32M
	111100 16M
	111110 8M
	111111 4M
	other illegal
SeeAlso: #01142,#01163,#01129