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Bitfields for Intel 82378/82379 Utility Bus Chip Select A Register

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Bit 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

See Also:

#01064,#01089,#01073