Bitfields for Intel 82434LX/NX Host CPU Selection:
Bit(s)	Description	)
 7-5	host CPU type
	LX: hardwired to 100 (Pentium)
	NX: "reserved" (101 on RB's system)
 4-3	reserved
 2	enable L1 cache
 1-0	Host Operating Frequency (set according to external bus speed)
	00: reserved
	01: 50 MHz
	10: 60 MHz
	11: 66 MHz
	(LX: bit 1 reserved, only 60/66 MHz supported)
SeeAlso: #01055,#01057