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Bitfields for Intel 82371FB/82371SB top of memory register

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Bit Description

7 - 4

top of ISA memory (in megabytes, less 1; i.e. 0001 = 2M)

3

ISA/DMA lower BIOS forwarding enable

2

(82371SB) enable A000/B000 segment forwarding to PCI bus

1

enable forwarding ISA/DMA 512K-640K region to PCI bus

0

reserved

See Also:

#01167,#01217