Bitfields for Intel 82378/82379 Utility Bus Chip Select A Register:
Bit(s)	Description	)
 7	extended BIOS enable (decode accesses to FFF80000h-FFFDFFFFh)
 6	lower BIOS enable (decode accesses to E0000h-EFFFFh,
	  FFEE0000h-FFEEFFFFh, and FFFE0000h-FFFEFFFFh)
 5	(82378ZB) floppy disk primary/secondary address select
	=1 use secondary address range
 4	(82378ZB) IDE Decode enable
 3,2	floppy disk address locations enable
 1	keyboard controller address location enable
	enables I/O addresses 60h,62h,64h,66h (82378ZB) or 60h/64h (82379AB)
 0	RTC address location enabled
	=1 enable decode of I/O ports 70h-77h
SeeAlso: #01064,#01089,#01073