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