Fairbanks FB3000 Kernel Program Operators Manual - Manual (Page 46)

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Appendix II: I/O Addresses & Control
INTERRUPT CONTROLLER
The FB3000 embedded PCB is a fully PC compatible control board. It consists of 16
ISA interrupt request lines. Most of them are already in use by other parts of the
board. Both ISA and PCI expansion cards may need to use IRQs, so make sure the
IRQs do not conflict when using add-on cards.
System IRQs are available to cards installed in the ISA expansion bus first. Any
remaining IRQs then may be assigned to the PCI bus. Check out an AMI
diagnostic utility to see the map.
DMA CHANNEL ASSIGNMENT
By default, Channel four (4) is used to cascade the two controllers.