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Bitfields for Intel 82378/82379 ISA Clock Divisor Register

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Bit Description

7

reserved (0)

6

enable positive decode of upper 64K BIOS at 000F0000h-000FFFFFh, FFEF0000h-FFEFFFFFh, and FFFF0000h-FFFFFFFFh

5

coprocessor error enable
1 = FERR# is driven onto IRQ13

4

IRQ12/Mouse Function Enable
0 = standard IRQ12
1 = mouse

3

RSTDRV enable
1 = assert RSTDRV until this bit cleared (for use in changing ISA bus speed)

2 - 0

PCICLK-to-ISA SYSCLK divisor
000 = 4
001 = 3
other = reserved

See Also:

#01064,#01069