Bitfields for Intel 82443BX/EX/LX AGP Command Register:
Bit(s)	Description	)
 31-10	reserved
 9	enable AGP sideband addressing
 8	enable AGP
 7-2	reserved
 1-0	selected AGP transfer rate
	00 = default
	01 = 1x
	10 = 2x
	11 illegal
SeeAlso: #01159,#01142,#01161,#01129