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