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Bitfields for Intel 82425EX/82371 X-bus Chip Select A register

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Bit Description

7

extended BIOS enabled at FFF80000h-FFFDFFFFh

6

lower (E000h) BIOS enabled

5

trigger IRQ13 on FERR#

4

IRQ12 mouse function enabled

3

(82371AB only) alias accesses to PORTs 63h/65h/67h to 61h
(else) reserved (0)

2

BIOS memory write protect

1

keyboard controller addresses (60h,62h,64h,66h) enabled

0

RTC addresses (70h-77h) enabled

See Also:

#01083,#01167,#01088,#01102