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